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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission.

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Old 09-23-2015, 01:43 PM   #1 (permalink)
LCAC_Man
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Tailhousing Brake Parts Interchange

I'm doing a Duramax Allison swap into a vintage motorhome(1976 FMC) and need the transmission parking brake that's found on a lot of the 2000 series allisons.
The engine trans package I'm looking at is a low mile LBZ/6sp All 1000(but it's 4x4), I also have found a cheap damaged Allison 2400 with the parking brake assy installed and those parts are in good shape.
Can I swap the tailhousing, output shaft, and brake assembly from the 2400 to the 1000?
Thanks

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Old 09-24-2015, 12:49 PM   #2 (permalink)
THEFERMANATOR
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Yes they can be swapped over, but it mIGHT give soem harsh 2-1 downshifts as well as harsh engagements goign from nuetral to in gear. GM used a proprietary C5 apply piston design that was smaller than other 1000/2000 series transmissions. The C5 piston is part of the tailhousing, so when you swap it you must also swap it as well if you do this style swap. You also MUST be careful when doing it to verifu proper endplay, and to do it with the trans standing up on the bellhousing so as to avoid dropping a torrington bearing out of place. I'm pretty sure that the 2 wheel drive 1000 housings have the 4 bolt holes for the parking brake mount on them, and use the GM C5 apply piston design the TCM is calibrated for. Also keep in mind the 2400 will require you to swap the 1000's gears over to the 2400's output shaft then re-assembled. I personnally would jst find a 2 wheel drive housing off of a 1000 as I'm sure you could find somebody willing to trade. In fact, I think Eric from DURABURB has several hanging on the wall as he converts alot of 2 wheel drives to 4X4's and I believe I remember seeing a stack of them when I was in his shop.

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Old 09-24-2015, 04:53 PM   #3 (permalink)
LCAC_Man
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None of the 2wd 1000's that I've seen have the 4 bolt mounting bosses for the brake assy. Only the 2000's (seen them in a bunch of Kodiak chassis) that are in motorhomes and medium duties seem to be set up that way...
Thanks for the info on the other related changes.
I'll keep searching.
I've considered just using a 2wd 1000 and fabricating a mechanical caliper disc parking brake...it may end up being the cheaper/better solution..
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