Hi guys,
I've been having a hard time finding a TDI transmission for my ALH TDI for a decent price. Everybody wants $2,000 for something that's used. Not even rebuilt. :-/
The junkyard has a 1.8 t 5 speed in very good condition for about 300 bucks.
I was thinking of purchasing it, I know the 4th and 5th gear ratios are a little bit different, but I was curious what my RPMs might be with the 1.8T transmission in 4th and 5th on the highway? I don't imagine going over 65mph.
Ps, (I'm not sure how to calculate the rpms based off the gear ratio) I'm hoping someone can help me with that here.
That's wild. Cascade German offers rebuilt boxes for $2k...
There's generally plenty of used ones for good prices. You can also upgrade to a 6 speed for surprisingly little money. See my thread on the 02S swap.
02S boxes do not have a vehicle speed sensor, but 2002 and newer Mk4s can be hacked to pick up vehicle speed via CAN bus from the ABS module instead of relying on that sensor. There is a free program on this forum (kw1281test) that enables you to do this, you just need to get your hands on a VAG KKL serial cable with USB converter. Or, if you have a VCDS cable already, you can try their Virtual Com Port drivers to enable it to be used.
2000-2001 cars support this as well, but you have to swap the instrument cluster for a 2002 or later immo III cluster... Which then also means dealing with immobilizer issues... Then again, kw1281test can help you there as well. It's just getting used to command prompt style work. No fancy gui.
Fun thing with the 02S is you can keep your original axles, starter, clutch hydraulics and use the same 5 speed clutch and flywheel.
car-part.com is my go-to for finding used parts like that at nationwide junkyards. I tend to prefer using local yards when possible so I can just pick it up and not worry about shipping charges.
If you wanted that 6 speed, it's found in 2019-21 Golfs with the 1.4 TSI and 2019 to current Jettas with the 1.4 and 1.5 TSI engines. The most commonly available on the used market are going to be the earlier ones from 2019-2020: TKR and TDZ codes. Geared identically, just some minor internal differences having to do with the pinion bearing, bellhousing and pinion shaft itself.
I just wrapped up swapping a 02S 6 speed into a 2003 Jetta wagon last weekend. Used a Mk5 5 speed bracket to hold the cables on the top of the transmission (two of the three bolt holes on the gearbox for that bracket are in different locations for Mk5 and newer gearboxes vs. Mk4 and older). Next time I do one I might instead make my own brackets to relocate the bolt holes to the original Mk4 location.
ALH 5 speed:
3.39 final drive
3.77 1st gear
2.12 2nd gear
1.36 3rd gear
0.97 4th gear
0.756 5th gear
TKR and TDZ code 02S 6 speed:
3.39 Final drive
4.11 1st gear
2.12 2nd gear
1.36 3rd gear
0.97 4th gear
0.77 5th gear
0.625 6th gear
