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Discussion Starter · #1 ·
Has anyone ever put an add on overdrive on a 1999 nissan frontier se manual 4x4 3.3l. It would help with fuel economy in 2wd and split gears. Meanwhile it wouldnt effect gearing and therefore not change towing capacity. The downfalls are that the rear driveshaft would need to be shortened and it would only be engaged in 4wd plus the initial cost.
 

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I don’t know of anybody installing one on a Frontier.
I do have friends that installed them on there early generation Dodge diesels.
The reason, with 4:10 gears the early diesels did not rev. With the “Gearvendors” splitter it allowed for lower rpm at highway speed.
Since then, they purchased later models which made the splitter unnecessary.
I don’t think it would be justified cost wise on a early model Frontier.
A ”Gearvendors” splitter is close to 3 grand, plus the cost of installation.
I can see spending the money on a vehicle worth forty grand, not on a vehicle where the cost is equal to the value of the truck.
Sorry.
Back when, I installed a 5 speed overdrive tranny out of a 2.5 ton truck in my 1983 Ford diesel. Worked so so. Should have gone to a splitter.
 

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Shortening a draftshaft is no big deal.
 

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As Whistler mentioned, the price never makes it feasible. $3000 buys a lot of fuel. Unless there was a factory option you could swap in, I'd say its not worth it.
What he said.

You're better off keeping the tires up to pressure, eliminating weight (don't carry junk around) and tame the right foot.

That and a good tuneup will save you a few $.
 

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Discussion Starter · #6 ·
I got to looking on ebay and you can buy used mopar overdrive units for 100-500 dollars, but idk what the shaft dimensions are for the output shaft of the transfer case are, the most common is the 46re or 46rh and the most common ratio is 0.69 that would bring my 3200rpm at 120kmh to 2200rpm at 120kmh
 
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