Click on image for the lowdown. 
====
| | | Forums66 Topics128,174 Posts1,057,048 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2006 Posts: 1,997 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,997 | Would a 5531 aux transmission be a good match for a 1948 2 ton with a 1954 or possible 1957 235 engine for power. Just looking for a little more highway speed. Wouldn't be for long distances. Only when I can't go the back roads.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Apr 2005 Posts: 926 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 926 | My '54 GMC 2 Ton has a 5531 backing a Clark 5 speed,also with Overdrive;it seems to run pretty happy with the Clark in 4th(Direct) and the Brownie in Over (0.74:1). With 38" tires and a 6.40 two speed,it gets about 66 mph at 2750 RPM. What tire diameter and axle ratio are you set up with? Here's a link to the number cruncher I like to use to figure this stuff out. Rocky Road Outfitters.com Speed | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Yes, it is and was intended for just that.
Be sure it has an overdrive gear, some don't and even if it is OD in 3rd they offered different ratios, some faster than others. | | | | | Joined: Mar 2011 Posts: 107 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 107 | The 5531 should work great with your truck and the engines listed. I have a 5831C in my 46 2-ton. It gives a bit more usable speed on the highway, and has improved the performance in traffic, especially with a load on the back. Also, without a load, it has allowed me to start from a stop in 3rd under, giving a good burst of speed for merging into traffic. As Grigg said, check the ratios in yours and make sure you have some that jive with your driving goals.
I posted awhile back a thread detailing some of my driving experiences. The thread was titled Auxiliary Transmission Ride Along. | | | | | Joined: Sep 2006 Posts: 1,997 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,997 | Well, I missed out on it. I was at the swap meet yesterday and saw it, and I wasn't familiar enough to know if it would work for me. It was .... this is the sad part.... $75. I couldn't get back there today to see if it was still available. I hope someone got it that could use it. It was a bit of a pig in a poke. Also, did have the linkage.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Super55, Paul I saw it today with a sold sign on it, so I just assumed you had purchased it, I didn't even ask what it went for. I have not seen many of them for sale and especially not with the mounts and remote shifter, if I had seen it before you I would have bought it for sure, sorry you missed it. Ask me to show you a couple of them still in trucks if you come to my pick a nick this year. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Different companion flanges come on these, Google 'companion flanges' and Spicer will tell you everything you need to know.
'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.
| | |
|
|
