blt2ski wrote:
CumminsDriver wrote:
I haven't seen it mentioned yet, but transmission gear ratios along with only having the 3.73 gears hurts the GM for the big tow ratings. The Allison has a 3.23 first gear compared to the Aisin with 3.72 I believe and the Fords 3.93 first gear. Throw in the 4.10 gears for the Ram and Ford and you have much better take off capability compared to the GM.
Rich
Did Allison lower the ratios of the 1000? Last I saw the 1000 and two of the 2000 series had a 3.10 1st gear. Two versions of the 2000 had a 3.54? 1st gear. OD and DOD were .71/.61 vs .74/.64 for the two. Do NOT remember 2nd and 3rd off the top of my head.
GM would get a lot more take off using the lower geared 2000 optioned trans. Being it the parking pawl version, or the pawless version, which last I saw was rated higher by 10,000 lbs or so.
Marty
Thee 2100/2200 has the same ratios as the 1000, the 2500 has the lower gears across the board including OD's.
http://www.allisontransmission.com/docs/default-source/specification-sheets/int2500_sa5340(201306)blk.pdf?sfvrsn=2
