Thread: Time for a replacement

So, the other day i'm driving home from work and lean into the throttle to downshift up a hill, hear a small metallic *TINK* followed by a quick climb to redline... but hey, 220k miles, the last 120k tuned, and definitely not used gently, i'm in no way surprised with the failure. I believe the use of an oversized trans cooler and regular services helped this... i digress.

Reading up on TEP website leads me to believe i lost the forward apply band. I limped it back to work in 1st&2nd gear, and now am finding my replacement.

I want to change to 3.29s, and it seems i cannot go with a 04+ trans, but a NA 3.29 97-02 trans should work, correct? I have HPT and no issue retuning for ratio correction.

As far as HD to non-HD, there are minimal differences, as far as I can tell... right?

Isn't one axle different? Do the cooler fittings swap? Does either one have LSD?

Anything I should look out for or prepare for? I plan on flushing the cooler, and changing their filter. and rear main/engine oil pan gasket while i'm that far.


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After a rather long and tedious day yesterday, the swap is done.

02 NA 3.29 trans, swapped my HD diff. I still need to re-tune for the ratio change, but HPT was being an ass because i didn't have wifi in the shop.

Decided to go out the bottom, since i have access to a lift and engine support tools.

First impression is that it drives incredibly smooth, and i have been overlooking the effects of mileage on my trans. I only drove it 6mi very gently, but it gave no indication of any issues.

Threw in some pictures to show the process a bit. New trans, broken band, diff comparison...








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