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overdrive gears available soon

tlib

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walpole ma
Proformance 4.90 and .69 OD ???

Tom,

I currently have 4.90 gears on my bobbed M-35. I run Goodyear MV/T tires.

Question ? What do you think the proformance will be if I add the .69 OD

gears to the tranny ? Thanks !!!!
 

spicergear

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Hmmm...you'll need to be more specific since my name is Tom as well. :)

You'll need a LOT of engine to pull 4.90's and that tall overdrive. Also, what's the Goodyear tire height so the info can be calculated better? Randy's Ring and Pinion, link below will allow you to put in your ratio's and figure out rpm for mph. For final drive ratio you will need to put a 0 then the decimal point like 0.69...or whatever overdrive you want to figure.

Randy's Ring & Pinion. Calculators.
 

m-35tom

Well-known member
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even with stock tires, and stock transmission, it is hard to believe there is enough power.
9.00-20 tires would be 1925 rpm at 60. .69od is all the motor can handle, and that is a final ratio of 4.64. you are talking about a final ratio of 3.82, it's not gonna happen.

tom
 

m-35tom

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quite a bit of diversity going on, of the 8 sets sold, 3 are going in m-37, 1 in a m-715, 2 in a stock deuce, 1 in a deuce with a lds, 1 in a bobbed deuce, and 1 in a deuce with a 8.4 cummins.

tom
 

JDToumanian

Active member
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Location
Phelan, CA
I see Walck's is out of the 0-70 mph speedometers...... I found them at Vintage Jeeps, Inc. for a little cheaper and they're in stock.

Vintage Jeeps,Inc. Parts & Jeep Accessories From The Jeep Parts Experts.

It's part number 640131 for $77.10

*** I just noticed that their part #640131 is listed as 0-60 mph. Part #640131 should be 0-70 but you may want to make sure. Also, Walk's (the link from Tom's website) shows them back in stock now. ***

I'll be ordering my .69 OD kit soon.... I've been pouring a lot of money into my deuce lately, and the OD kit is next but it may be after Tower Park before I have the money. I have a busy schedule with my deuce this year, air shows, convoys, parades, camping and shooting trips. To prevent haste causing waste, I'm going to rebuild a transmission at my leisure and swap it for the one in my deuce when it's ready.

Jon
 
Last edited:

tlib

New member
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Location
walpole ma
Proformance 4.90 and .69 OD ???

Tom,

Sounds like I should use your .69 on my stock Deuce with Goodyear MV/T

tires (48") and leave the bobbed deuce alone with the 4.90 gears and Goodyear

MV/T tires (48") ? I could compare them for RPM'S,SPEED,ETC. ???

What do you think ?

Thanks !!!
 

m-35tom

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yes, 9 so far. including mine.

48" tires are going to be a bit big for .69 od.
i reccomend not larger than 11.00 x20 or 14.5R20XL

tom
 

OPCOM

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:cool:_____Diesel Fitter !_____:cool:

For Cool and Useful Modifications to a Large Diesel truck,

As Judged Unanimously by the Grand Visier of PBR Welder Hacks,

The Covetous and Rarefied Diesel Fitter Award is Hereby Bestowed Upon

m-35tom
 

TexAndy

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Bee County, Texas
Hmmm...you'll need to be more specific since my name is Tom as well. :)

You'll need a LOT of engine to pull 4.90's and that tall overdrive. Also, what's the Goodyear tire height so the info can be calculated better? Randy's Ring and Pinion, link below will allow you to put in your ratio's and figure out rpm for mph. For final drive ratio you will need to put a 0 then the decimal point like 0.69...or whatever overdrive you want to figure.

Randy's Ring & Pinion. Calculators.

There's another good calculator here:

4Lo.com :: Final Gear Ratio, Crawl Ratio, Tire Size Calculators
 

m-35tom

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that is a big IF, the answer is maybe. you would still have to change the mainshaft to use needle brngs for 2nd or it WILL fail. you would also have to make spacers to be able to use the civi gears as they are not a direct fit.

tom
 

jimh1985

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Location
lizella, GA
Has anyone had problems with lugging the motor with these? i Would thing shifting from 4th to 5th is a prob.
This is what has kept me from trying them.
 
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