Transmission Swap
I am wondering if there is an MB tranny (automatic 5 or 7 speed) that would bolt up to an M110 motor.
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EZ:
From ~81 thru 85 the 722.3 was used with OM617s and M110s. There is the main case. Use all the internals and the tail housing from the 722.5. |
Thanks Frank. The 722.5 seems to be the best the choice for replacement in my '77 280E because it's still hydraulically shifted rather than electronically. The question now is: With the electronic overdrive, are gears 1 thru 4 closer together than in the older 4-speed 722 trannies? This is what I am trying to accomplish.
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EZ:
From inception the 722.3 had a 1st ratio of 3.68; mid-1988 that changed to 3.87. 4th 1:1 The 722.5 has a 1st ratio of 3.87. 4th 1:1 5th .75:1 The 722.1/2 boxes have a 1st ratio of 3.98. 4th 1:1 All have a 2nd of about 2.4, and a 3rd of about 1.43. The only noticeable changes are in the 1st ratios. Does the 722.5 have closer ratios than a 722.1/2? Practically speaking, no. Significantly closer ratio spreads are achieved with manual boxes, or with some much newer all-electric auto boxes. |
Frank, I would rather give up the overdrive and have the 5th gear 1:1, thus allowing closer ratio spreads among all 5. I suppose I´m dreaming.
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The 722.5 trans bellhousing is setup for the starter on the LH side, where as an M110 engine starter is on the RH side. You would need to cut the bellhousing off the 722.5 main case & weld in a M110 compatible bellhousing.This has been done by some manual conversions
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The 722.5 (5-speed) has an overall ratio spread of 5.16 (3.87/.75). The 722.6 (5-speed) has an overall spread of 4.34 (3.6/.83). The Mustang T-5 (5-speed w/ close 5th) has a spread of 3.69 (2.95/.8). The Ford AOD (4-speed) has an overall spread of 3.43 (2.4/.7). The closest ratio T-10 (4-speed) has a spread of 2.20 (2.20/1). Irrespective of the final drive, the change in engine speed from the lowest ratio to the highest is fixed by the internal gearing. |
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