VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: One_punchmachinegun on April 12, 2012, 04:29:53 pm
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OK, so now after really looking into what i'll have to do to get the FF transmission into my mk2 Jetta I'm torn. ??? The stock transmission is a AVX,really not the best of the best. But to avoid possible complications I might stay with AVX. But i would LOVE to run the FF, Its that i just cant seem to find an easy way to get it in there. Everything is out of the bay right now so if i need to configure something its possible. I am at a loss. What you do? Input is appreciated ;)
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Oh yeah, i plan on trying to get this all back in the car by the end of the weekend. ;D
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Oh jeez here we go again, another AVX vs ___ debate incoming... ::)
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why can you not use the mk1 trans in the mk2? the mk2 bracketry should bolt right up..
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the one arm from the far left of the trans will but the shift linkage one wont, the FF lacks the three bolt holes for the bracket,
Would the one arm from the left of the trans hold the weight/torqe safely? I thought about just beefing that up, or welf the other backet on to the trans but i dont know how well that would go..
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Pictures of the FF trans and the bracket that wont fit with out lots of work.
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(http://i1132.photobucket.com/albums/m571/TimmothyMelcher1/012-1.jpg)
(http://i1132.photobucket.com/albums/m571/TimmothyMelcher1/001-1.jpg)
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uh....
oh wow batman...
that trans is SPECIFIC to the mk1..
must be a PRETTY EARLY version to not have the bosses cast in the case.
even my mk1 4A 4spd trans has the bosses to mount the mk2 bracket..
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The FF and FN transmissions were most commonly found on early 80's stuff.. So without the mk2 in sight at that point there was no need to have the extra holes in the case.
The 4A would have been put in while the mk2 was well under production, explaining why it has the mk2 mounting locations.
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The FF and FN transmissions were most commonly found on early 80's stuff.. So without the mk2 in sight at that point there was no need to have the extra holes in the case.
The 4A would have been put in while the mk2 was well under production, explaining why it has the mk2 mounting locations.
mk2s never came with a 4 spd tho..
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I read on here that the 4A was the only 4 speed swappable to a MK2, possibly MK3 too can't remember.
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The FF and FN transmissions were most commonly found on early 80's stuff.. So without the mk2 in sight at that point there was no need to have the extra holes in the case.
The 4A would have been put in while the mk2 was well under production, explaining why it has the mk2 mounting locations.
mk2s never came with a 4 spd tho..
Thanks einstein ;). At the time they may or may have not known just exactly what they were going to offer and in what. Most likely the reason the 83-87 (for sure) trans are interchangeable.
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ok, so where do i stand what would you guys do, im starting to think about JY hunting but thats a hassel all in its self. Where im at there are NO diesels, just gassers not saying it not possible to grab one of those just not preferred. Any one want a FF trans? :P Trade ?
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Gas cars are not to be completely un looked at.. MANY DID COME WITH diesel like ratios, so look at them for sure.
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ok, ill consider. other thing is possibly picking up a shot trans.
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after looking at it, cant i just swap the bell housings? since thats what it bolts up to?
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the "bell housing" is actually the trans case, in all actuality..
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no.... the whole case needs changed over... this requires skill and shims to set the bearing preset on the diff and ring/pinion .. not many have the shims...
yes very few mk2 had 4 speed.. but in 85 a few did..
in late 83 they added the 3 nostrils to the tranny... in prep for the mk2... by then the ff was now a fn i beleive... ff is like 78-80... then fn 81-84... the 1.7 gassers and diesels had them.. 1.8 got close gear ratio..
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It bolts through the two halves of the differential case.
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yes, yes it does. Im going to avoid possible destroying something, so im going to just throw the AVX in and run it for now, while Junk Yard hunting, i just bought two new axles 90mm so with the likelyness of me finding a diesel trans being slim to none im just going with the AVX. Thats the reason i wanted to stay away from the gasser transmission, i would have to replace the axles and then the flywheel and clutch that i just bought to..... so i just will be patient and wait for a good diesel trans :'(
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Here's the ACN AVX and FN ratios copied from A2resource.com
The AVX and FN has 90 mm axles, the ACN has 100 mm axles (90 mm with a ?, not sure what that means), all 3 have different speedo gears from each other.
How difficult would it be to make a mount for the shift linkage to install the FN in your Jetta? Per the ttools calculator, the AVX at 65 mph will be doing 3067 rpm while the FN will be doing 2657 rpm at the same speed. That's a drop of 410 RPM. Is that worthwhile to you to do all that work?
(http://i1183.photobucket.com/albums/x480/Ecodiesel92/ACNAVXFNratios.jpg)
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If you have both transmissions already out.. you could easy see what needs to be done to the FN to make it fit in place of the Avx.. Any machine shop or even you might be able tp make it happen easily
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ACN is 90mm.. 100% positive..
i had to swap it when i dropped one in my GTI for the 100mm axles.
the reason for the different speedo gears, is the different final drives..
AVX has 4.25:1 and green gear?
FN has 3.89:1 and white gear.
ACN has 3.67:1 and red gear.
and that bracket, the one that needs bosses on the trans to install? thats an ENGINE MOUNT, not a shift linkage bracket..
you NEED THAT BOLTED ON REAL GOOD.
since the FN has no mounting bosses, it seems basically impossible to install it..
an ACN-style trans is cheap, easy to get, and drops right in, no messing around..
so, either keep that FN around for a mk1 swap, or else sell/trade it for something better.
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Also remember that it is an FN if you do decide to sell. Their ratios will bring top dollar :)
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yeah ima sell it :'( I sat down and looked both trans over today and have decided that it wouldnt be worth the time and effort to make it wook and then possibly have problems later down the line. would have been nice.
I will run the AVX for the time being until i source another transmission at a later point, since i do no highway driving really not at that much of a loss plus the trans was free. I would like to get a chunk of $$ for other mods, Maybe a giles pump or something.
Thank you all for the input and this place is great. :)
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Selling one transmission will get you 1/5th of the way closer to a Giles pump.
Sent from my DROID X2
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i know ;D baby steps
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ACN is 90mm.. 100% positive..
i had to swap it when i dropped one in my GTI for the 100mm axles.
the reason for the different speedo gears, is the different final drives..
AVX has 4.25:1 and green gear?
FN has 3.89:1 and white gear.
ACN has 3.67:1 and red gear.
and that bracket, the one that needs bosses on the trans to install? thats an ENGINE MOUNT, not a shift linkage bracket..
you NEED THAT BOLTED ON REAL GOOD.
since the FN has no mounting bosses, it seems basically impossible to install it..
an ACN-style trans is cheap, easy to get, and drops right in, no messing around..
so, either keep that FN around for a mk1 swap, or else sell/trade it for something better.
So, would the ACN be a good choice for my Ecodiesel with the governor mod? How many HP and ft lbs pf torque would you say one need to drive an ACN and not be a dog?
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ACN is 90mm.. 100% positive..
i had to swap it when i dropped one in my GTI for the 100mm axles.
the reason for the different speedo gears, is the different final drives..
AVX has 4.25:1 and green gear?
FN has 3.89:1 and white gear.
ACN has 3.67:1 and red gear.
and that bracket, the one that needs bosses on the trans to install? thats an ENGINE MOUNT, not a shift linkage bracket..
you NEED THAT BOLTED ON REAL GOOD.
since the FN has no mounting bosses, it seems basically impossible to install it..
an ACN-style trans is cheap, easy to get, and drops right in, no messing around..
so, either keep that FN around for a mk1 swap, or else sell/trade it for something better.
So, would the ACN be a good choice for my Ecodiesel with the governor mod? How many HP and ft lbs pf torque would you say one need to drive an ACN and not be a dog?
well, like ive mentioned a MILLION TIMES...
these ACN style trannies came STOCK behind 85hp gas engines..
and they are not a dog in any way. i like the way my GTI drives better with the ACN, than with the 9A in it..
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I have a lead on an ACN and may go check it out tomorrow. It is off the car and supposedly has 150k on it. How does one check out a transmission on the bench? Can all the gears be engaged and I turn the main shaft by hand and watch the axle flanges spin? I will bring a dial indicator and make sure the main shaft is not bent.
What's a reasonable price for an ACN? And it should bolt right into my Ecodiesel (replacing the AVX) with no modifications or re-work right?
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I have a 7A and an FF I would glady trade one for an ACN if someone is willing :D
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I have a lead on an ACN and may go check it out tomorrow. It is off the car and supposedly has 150k on it. How does one check out a transmission on the bench? Can all the gears be engaged and I turn the main shaft by hand and watch the axle flanges spin? I will bring a dial indicator and make sure the main shaft is not bent.
What's a reasonable price for an ACN? And it should bolt right into my Ecodiesel (replacing the AVX) with no modifications or re-work right?
let me know how it goes because I'm gonna be looking to put one in my gov modded eco.
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I have a lead on an ACN and may go check it out tomorrow. It is off the car and supposedly has 150k on it. How does one check out a transmission on the bench? Can all the gears be engaged and I turn the main shaft by hand and watch the axle flanges spin? I will bring a dial indicator and make sure the main shaft is not bent.
What's a reasonable price for an ACN? And it should bolt right into my Ecodiesel (replacing the AVX) with no modifications or re-work right?
let me know how it goes because I'm gonna be looking to put one in my gov modded eco.
a mk2 trans is a DIRECT SWAP into a mk2. the only thing that wont be plug and play is the gear position switch/reverse light switch...
the late mk2s had a 2 pin switch, just like the OLD mk1 cars..
then the later mk1, and early mk2 cars had the finicky switch that ALWAYS failed..
all ACNs have that type of switch.. so your gonna have to find a plug to go on that switch, to make your reverse lights work.
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adding in a fog light relay, using the switch as a ground helps save its life...
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adding in a fog light relay, using the switch as a ground helps save its life...
Why, exactly; more importantly how is it integrated? Just wondering.
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adding in a fog light relay, using the switch as a ground helps save its life...
Why, exactly; more importantly how is it integrated? Just wondering.
As opposed to having the two lights full power running through the switch first. Sure it will pro long its life.. but most have already lasted 25-30 years... ;)
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the 2 prong ones last for life... the crappy shiftlight ones.. couple years max.... aka ones he speaks of... and correct.. relay takes the load of the lights vs the switch..