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12 members (Johnny N, J Lucas, 1953 Forever, Chip O, Hotrod Lincoln, CarSnob, 1 invisible),
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Forums64
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Jan 21st, 2020
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Joined: Sep 2018
Posts: 7
OP
'Bolter
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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?
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Joined: Sep 2001
Posts: 31,775
Bubba - Curmudgeon
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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?)
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Joined: Sep 2018
Posts: 7
OP
'Bolter
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Thx soo much for the reply. No I have not checked with tech tips yet but I will.
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Joined: Mar 2007
Posts: 5,143
'Bolter
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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.
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Joined: Sep 2001
Posts: 31,775
Bubba - Curmudgeon
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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.
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