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#1424551 Sun Sep 19 2021 07:17 AM
Joined: Sep 2018
Posts: 7
F
'Bolter
Please forgive me if I missed answers to my question while searching the archives. I have an all original drivetrain 3100. Including a factory 4 speed on the floor. I would like to leave it mostly original but improve the drivability to more modern highway speeds. Is there a way to keep the original rear axel with torque tube but swap out the differential gears for something that would allow improved highway speeds?

FLRustyGold #1424556 Sun Sep 19 2021 11:26 AM
Joined: Sep 2001
Posts: 31,647
Bubba - Curmudgeon
Yes - Mother Trucker sells an excellent 3.55 Ring & Pinion Set (and, I think the old instructions).

Maybe someone will post a link to an installation parts set (bearings/seals/gaskets/etc necessary for a good/tight installation, and, no noise when running).

A few tools/gauges are need - Harbor Freight and others sell them.

There may be more information on-line (I will check the Tech Tips here - have you checked them?)


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
FLRustyGold #1424566 Sun Sep 19 2021 12:57 PM
Joined: Sep 2018
Posts: 7
F
'Bolter
Thx soo much for the reply. No I have not checked with tech tips yet but I will.

FLRustyGold #1424602 Sun Sep 19 2021 09:46 PM
Joined: Mar 2007
Posts: 5,071
Leo Offline
'Bolter
I did exactly what Tim just suggested. Then added 30" tall tires and a 261 (able to get it cheap) and I had a top speed of 85 mph.

FLRustyGold #1424631 Mon Sep 20 2021 01:06 AM
Joined: Sep 2001
Posts: 31,647
Bubba - Curmudgeon
From an old post:

“I have Cooper Tire SRM II LT215/85R16 black truck radials on my Suburban (they are pretty old, 10+ years).

The 1954 16" rims are 4.5" x 16".

Your 1947/48 rims might be either 4.0" or 4.5"

The mounted tire diameter, as Carl posted, is around 31". The "advertised" diameter is around 28".”

3.55 ring & pinion and all new rear-end and torque-tube and u-joint parts.

On a long flat straight empty road, I once had in up to 93 MPH - to impress a friend.
He was not impressed until I told him to check the speedometer.

Never again.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]

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