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Joined: Mar 2022
Posts: 40
B
'Bolter
Thanks for the tip EdPruss! Will definitely keep an eye open. Ah shoot, after reading panel fan's post I remembered mine has the drive shaft handbrake, so that would definitely complicate installation.

Last edited by BurningTracks; Fri Apr 29 2022 02:52 PM.
Joined: Oct 2015
Posts: 377
P
'Bolter
Hi Grant , I take it your hand brake is a drum on the rear of your trans. which would complicate getting a safety if you switch to an overdrive trans.
A truly expensive option would be to locate a Gear Vendors over drive divorced unit which could be mounted in the place of your hanger bearing which come I understand with a .80 O/D .
You never know what you can find on the internet used . Good luck .

John


good planning is no substitute for dumb luck
Joined: Jun 2011
Posts: 4,522
E
'Bolter
Many Brownies came with Tru-Stop disc brakes on the rear. Many were disabled with the advent of Spring Brakes, however they make for a convenient and legal setup with a brake on the last gearbox. There is a place in Denver that has new pads. On my ‘54 GMC, someone had inserted a smaller disc that had worn so badly, I had to back-up to get it to release. Luckily I had saved the proper size disc in my junk.

Photo shows 5531 installation in my ‘55.2 GMC.

Ed

Attached Images
F4F0A954-61D2-4934-8CA6-A15E7697AC44.jpeg (304.81 KB, 109 downloads)

'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.
Joined: Jul 2014
Posts: 362
1
'Bolter
My Brownie has a drum e-brake with external contracting band. The brake was made up after its original installation and has the anchor for the band welded to the rear cross member. I think it dates from before spring-brakes as the brass tag says 6231A Spicer Brown-Lipe. But why the custom brake setup? It was in a GMC log truck when I got it, behind a 6-71 diesel.


51 3800 PU, 55 235 (w/cam, headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.
Joined: Mar 2004
Posts: 5,539
M
'Bolter
Driveshaft parking brakes need to be installed on the last transmission so they work in case any of the transmissions are put in Neutral.

Mike B smile

Joined: Jul 2018
Posts: 204
P
Rustbucket Ranch
Seeing that your original rear end is an HO72, the third member can be swapped out with one from a 3/4 ton HO52 rear end for a possibly better ratio. I've read somewhere that '67-72 Chevy 3/4 tons with an auto trans have a 3.73 gear, but I bet finding one in New Zealand would be rather difficult.

A 14 bolt would be good to swap under your truck, and would be easier.


1949 Chevy 3100 (In the family since new)
1955 Chevy 3100 (Dad's truck)
1955 Chevy 6500 (Possible parts truck?)
1958 Chevy 3800 w/ 9 foot bed (Current project)
1959 Chevy Spartan 10400
More pics in my albums [get.google.com]
Joined: Nov 1995
Posts: 5,481
Unrepentant VW Lover
Hey gang -- once again I get to blow my whistle and throw a flag out onto the field ... wink

Before we get him too tall on his gearing, shouldn't we be asking about the other links in the power chain -- such as what engine, which size wheels and tires, blah blah blah?

Just asking as it seems to me that if he's got a 6-cylinder engine, he may not have enough power/torque for Brownies, tall gear sets, etc ....

In my own experience, I did the whole gear swap for faster speeds ... but ... I had a 1-ton, as well. 4.10 gear in rear and 17-inch wheels. Only I had it all powered by a 216. My truck couldn't get out of its own way, much less anyone else's. Over geared and under powered. Gotta look at the whole equation, not just one part.


headscratch


John
Cisgendered heteronormative aggressor perpetrating problematic toxic ideas of Chevrolet normativity smile

'49 Chevrolet 3804




Joined: Sep 2011
Posts: 1,143
B
'Bolter
Originally Posted by John Milliman
Hey gang -- once again I get to blow my whistle and throw a flag out onto the field ... wink

Before we get him too tall on his gearing, shouldn't we be asking about the other links in the power chain -- such as what engine, which size wheels and tires, blah blah blah?

Just asking as it seems to me that if he's got a 6-cylinder engine, he may not have enough power/torque for Brownies, tall gear sets, etc ....

In my own experience, I did the whole gear swap for faster speeds ... but ... I had a 1-ton, as well. 4.10 gear in rear and 17-inch wheels. Only I had it all powered by a 216. My truck couldn't get out of its own way, much less anyone else's. Over geared and under powered. Gotta look at the whole equation, not just one part.
headscratch

If it was my rig I've got a NP540 direct 5spd I'd put In it. 4.10 would be good in direct for crusing along until you hit a hill or headwind, then run in 4th.


BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
Joined: Jun 2011
Posts: 4,522
E
'Bolter
NP-540 series is a good choice. I put one in my early Bronco with a Buick V-6(fuel mileage) and used the top 4 gears all the time except with large load(10 thousand lbs.)

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.
Joined: Apr 2005
Posts: 3,055
C
'Bolter
What we had on our old forklift was a pinion mounted parking brake. It was a large disc (14"??") with the caliper bracket mounted to the pinion flange bolts. Was super effective since any force applied to the rotor was multiplied by the rear end ratio, 6.67 in this case. Have seen this set up on hot rods with both mechanical or hydraulic calipers. The newest Factory Five kit cars have both a large and small park caliper on the rear discs.


Evan
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