Bolt on Overdrive?
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Freshman User
Joined: May 2004
Posts: 43
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From: bc
Bolt on Overdrive?
i was watching trucks and i noticed that he had put a overdrive on a transmition. he jsut bolted it onto the back of the tranny and it looked like a handy part for an old truck where u dont have the option for overdrive, i was wonderin if anyone knew where i could get one of these.
Mountain Pass
Joined: Aug 2004
Posts: 162
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From: Roswell, GA
You're talking about the orange cheby truck project, right? I believe the overdrive unit he used was from a company called Gear Vendors. It's quite expensive. They sell adapters to put it behind most manual or automatic transmissions and behind most transfer cases if the truck is 4x4.
Search google for Gear Vendors to find more information. Also, Advance Adapters sells another brand called Saturn overdrives. US Gear another source for auxillary overdrives.
Search google for Gear Vendors to find more information. Also, Advance Adapters sells another brand called Saturn overdrives. US Gear another source for auxillary overdrives.
Post Fiend
Joined: Mar 2004
Posts: 24,418
Likes: 3
From: San Francisco, Ca.
Advance Adapters also sells a unit that installs between the engine and Transmission (manual) called a Ranger Torque-Splitter.
But as flat4vw said, they are pricey.
I bought my splitter in '85 from Advance Adapters for $900.00.
Not sure what they cost now.
I guessing around $1500.00.
But as flat4vw said, they are pricey.
I bought my splitter in '85 from Advance Adapters for $900.00.
Not sure what they cost now.
I guessing around $1500.00.
Senior User
Joined: Jul 2004
Posts: 199
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From: Griffin. GA
I priced them a few months ago, and for my 78 to put behind my c6 it was $2200-2300 then you had to shorten the drive shaft. But they are really tough, and if my memory serves me can handle like 500 horses. Supposedly last practically forever. I'm really looking into it for mine, but for the price of it i can just buy a lot of gas.
Elder User
Joined: Aug 2005
Posts: 572
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you might look into an over drive tranie, a zf is super strong and a mazda came behind 88-96 modle 300s, gear ratios are a little different but still overdrive. another factoer to consider is gear ratio and tire size. they all work together. as for the tranies both are in 2 and 4x4 versions. and require hyd cluches, but most of the time could should be able to be retro fited for older makes. I know the zf is popular in 66-77 broncos and there is no room becasue of the brakebooster and they still work.
Mountain Pass
Joined: Aug 2004
Posts: 162
Likes: 0
From: Roswell, GA
Yeah, as far as bench racing goes, they're the answer to everything - you can have your cake and eat it too - but i feel the price puts it way out most enthusiasts' range, mine especially. I see factory rebuilt Gear Vendors units for sale on evilBay every once in a while, apparantly you can use, abuse, and then rebuild them forever.
The really cool thing about the GV unit it is that, according to their website, you can shift it under full throttle. However, over on the fordsix forum, i was reading comments from a guy who installed one on his manual tranny bronco, and it sounded like he had to clutch before shifting the GV unit, or deal with a pretty bad clunk. Maybe that was under part-throttle though...
The really cool thing about the GV unit it is that, according to their website, you can shift it under full throttle. However, over on the fordsix forum, i was reading comments from a guy who installed one on his manual tranny bronco, and it sounded like he had to clutch before shifting the GV unit, or deal with a pretty bad clunk. Maybe that was under part-throttle though...
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