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Re: Rear end gear ratio?
Ky59apache #1340835 Tue Jan 07 2020 04:00 AM
Joined: Dec 2015
Posts: 2,112
Big Bolt Forum Moderator
I ran that size tires on my 59 Suburban, with 3.40 gears in the rear end (79 Blazer rear axle) with an SM465 trans an loved it. I could cruise along at 90 if I wanted to and it pulled whatever I put behind it (broulght my bog bolts home, weighed in at 17,340 with the 59 behind it). That said, depending on how you are using it, and with the 235 , your 3.90 gears should be great!


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof
Re: Rear end gear ratio?
Ky59apache #1340859 Tue Jan 07 2020 12:57 PM
Joined: Dec 2018
Posts: 517
A
Shop Shark
Originally Posted by Ky59apache
I haven’t bought the trans yet so which one should I look for? I’m also planning on running around 31x10.5 tires on it.


Seems like that tall of a tire/wheel combination will place allot of strain on an old driveline.





Re: Rear end gear ratio?
Ky59apache #1340950 Tue Jan 07 2020 11:22 PM
Joined: Aug 2019
Posts: 36
K
Wrench Fetcher
Thanks Mike B. That website helped out tremendously!

Re: Rear end gear ratio?
Ky59apache #1348614 Tue Mar 03 2020 12:35 AM
Joined: Aug 2019
Posts: 36
K
Wrench Fetcher
sorry its been awhile. you are correct Mike B. I'm changing out the 3 speed for a 4 speed. the trans in it has a 2.85 first gear. I'm thinking a taller first gear in a 4 speed would be better? I would like to drive down the highway without overdoing it RPM wise- 2200 to 2500 RPMS. thanks

Re: Rear end gear ratio?
Ky59apache #1348622 Tue Mar 03 2020 01:32 AM
Joined: Jun 2011
Posts: 3,627
E
Shop Shark
Three speeds and four speeds both have direct in top gear.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Rear end gear ratio?
Ky59apache #1348630 Tue Mar 03 2020 02:07 AM
Joined: Mar 2011
Posts: 1,505
J
Shop Shark
According to the 1959 truck resto pack your truck rear end had a Regular Production Option RPO 3.70 and 3.38
You could find a 3.38 ring & pinion 3rd member and install in the axle housing and you could drive at 70-80 mph all day long.
The Resto pack does not seem to show the RPO number for the 3.38 RPO, Teeth 13-44

1959 Resto pack PDF page 41.
1959 CHEVROLET TRUCK OPERATOR'S MANUAL 1/2 Ton Rear axle ratio spec. (bottom of page)

xfiles

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