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Old Mar 8, 2016 | 07:46 PM
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Question electric overdrive

have 78 F150 351M with C-6 tranny
Looking to put an electric overdrive on the back of the tranny so I get better mpg and engine works less . Anyone have input on this and what overdrive is best for simple and most dependable or better yet as bullet proof as possible?
thank you for the info.
 
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Old Mar 8, 2016 | 08:15 PM
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Gear Vendors... around $3000 for a c-6.
 
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Old Mar 8, 2016 | 09:01 PM
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OMG was hoping for half that
 
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Old Mar 8, 2016 | 09:08 PM
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Once in a while a used one will show up on ebay. Be sure to run a cooler on the tranny if you install OD.
 
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Old Mar 11, 2016 | 12:27 AM
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will be putting on a tranny cooler , like to keep the fluids separate, friends old car had 351 and a C-4 , cooling tube for tranny leaked and antifreeze took out tranny.
my 77 F250 with C-6 had two coolers and was great, fluid came back low temp and ready to work lol
 
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Old Mar 11, 2016 | 08:06 AM
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your engine would work less if you swapped out for a overdrive transmission that had a lock-up torque converter. There are threads on the swap and running different type transmission controllers. It doesn't look too hard
 
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Old Mar 11, 2016 | 11:29 AM
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I have the Gear Vendors OD and it's great. It's bullet proof, they put the same unit in dump trucks. It's only 22% overdrive though.

As far as a latter model trans I haven't heard of any adapters. If someone does please post.
 
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Old Mar 11, 2016 | 02:27 PM
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351M and 460 share the same bell housing you should be able to E4OD with a trans controller
 
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Old Mar 14, 2016 | 09:51 PM
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Not your question, but I put 3.00 gear sets in a 79 Bronco that had 3.50. Hwy cruising is comfortable now. 33" tires also. Rear 9" was easy. Frt 3.00 hard to find. If yours is 2wd not an issue
 
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