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They all show SAE No. 2 engine mounting...

M1078A1 spec sheets In case anyont wants to read these...

Specs sheets Here are the specs on the parts mentioned.

Found another stewart and stevenson m-1078A1 spec sheet that says cat 3126, with a 3700SP I'm no master mechanic but from my view all things are pointing to very similar specs on all of these. My biggest fear right now is that the electronics won't jive if i have a 3700 and want to swap...

Looks same Not sure. Im looking at a BAE spec sheet that says Allison 3700SP. It is for an A1 with the CAT C7... oh what a tangled web... found a spec sheet on the 3070PT, looks identical from my eye. Gearing is identical to the 3500SP, so @2500rpm, should be going 67.5 mph...@2200 59mph. im...

Anyone in okc area want to help me try it out? I dont have the equipment for it, but know my way around a wrench... Would be nice for everyone else to know what's possible on these LMTV's. Maybe someone that would like to start doing conversions on the side??? Also from what im told above, it...

But does anyone know if the 3500 is the same case as the 3700? Looking at the spec sheet pdfs they look pretty much identical in the drawings. The 3700 has the transfer case (which looks like it will bolt right on) but other than that i see no physical external difference. Maybe the oil pan...

Transmission swap Does anyone know if the allison 3500 can replace the stock 3700? Wouldnt that mean a higher top speed as well? 6 gears instead of 7, but 3500 sixth is 0.65:1 vs seventh in the 3700 0.78:1 . 1st in the 3500 is 4.59:1 vs in the 3700 6.93:1, so low end would suffer. Someone...

Can the ring and pinion gears be taken from a 3.07 diff and swapped in the 3.90 diff? Or does the whole differential need to be swapped? Trying to save on some shipping if possible. It seems the recycler dismantles these axles anyways, so why not just get some sets of the gears, since thats...

Id like a set or two if anyone is picking some up and driving through OKC... long shot but I figured I'd put it out there.

Anyone know where to find a set of these 3.07's? Ive tried contacting the salvage in tx, but havent heard back. Would like to get some shipped reasonably. Theres a set on ebay right now for 2500 which i think is ridiculous.