Dodge Cummins Diesel Forum - Reply to Topic
89-93 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

Thread: 10 speed behind a 12 Valve. Ever seen it? Reply to Thread
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  Topic Review (Newest First)
01-26-2020 10:26 AM
Uglydog56 I ran a 5831 brownie in my 80 Chevy dually with 4.56's. The .73 over was a life saver. There are several versions A-G. I can't remember if it's the C or D, but it has .86 over and 1.23 under, just what you're looking for. Shifting a non-synchro trans isn't difficult, it just takes a bit of practice.
01-20-2020 11:55 PM
1320Fastback I have a Mitchell 3500 (Google it) that I am going to put in my truck soonish. Its a modern day BrownyBox. It is all aluminum and weighs only 83 pounds, is fully synchronized which BrowneLipe boxes were not and is a 5% Under/ 18% Over ratio.
01-19-2020 02:12 AM
93oneton
Quote:
Originally Posted by myother4x4isaCJ7 View Post
I think your talking about a browny box. Those are great and I believe can even be had with overdrive so you could have a low/direct/Overdrive the only downside is they are big/heavy and arenít synchronized. Iím fairly certain they come in 2, 3 and 4 speeds.
My dad runs a browny box in a 1 ton Chevy service truck he has. I have contemplated putting one in my truck
01-17-2020 11:06 PM
RustyRedneck I'd be fine with just under and direct. I can go 60 at 2000 rpm in 4th. Obviously I don't pull in overdrive but 60 is fine with a trailer for me. I haven't found a Brownie yet but if I can find one on the cheap, I might go that route.
01-17-2020 01:16 PM
myother4x4isaCJ7
Quote:
Originally Posted by 1070 View Post
Back in the day they put under drive and over drive boxes in 10 wheelers. If I remember correct brownlight made them. You might be able to find one in a old big truck junk yard. A buddy of mine has one in his pile but I think it is only a under drive. They should handle the touqe.
I think your talking about a browny box. Those are great and I believe can even be had with overdrive so you could have a low/direct/Overdrive the only downside is they are big/heavy and arenít synchronized. Iím fairly certain they come in 2, 3 and 4 speeds.
01-17-2020 11:05 AM
1070 Back in the day they put under drive and over drive boxes in 10 wheelers. If I remember correct brownlight made them. You might be able to find one in a old big truck junk yard. A buddy of mine has one in his pile but I think it is only a under drive. They should handle the touqe.
01-17-2020 10:52 AM
myother4x4isaCJ7
Quote:
Originally Posted by RustyRedneck View Post
From what I've heard, it's usually the input shaft of the SM420 that gives trouble. Depending on how complex it is, I might be able to build a bigger one that will take the torque. Either that or modify the existing one to help mate to the other transmission, shortening in the process and hopefully getting away from the weak points.
Yes the one I broke in my old chev was the input shaft.
01-16-2020 09:03 PM
RustyRedneck From what I've heard, it's usually the input shaft of the SM420 that gives trouble. Depending on how complex it is, I might be able to build a bigger one that will take the torque. Either that or modify the existing one to help mate to the other transmission, shortening in the process and hopefully getting away from the weak points.
01-16-2020 06:13 PM
myother4x4isaCJ7
Quote:
Originally Posted by RustyRedneck View Post
I think I have decided on an easier way. I think what I'm going to do instead of a 10 speed which is out of my price range, is install a 4 speed Muncie SM420 behind the Getrag 360. I'll primarily be using 3rd and 4th in the SM420. If my Math is correct, 3rd should essentially split my gears in half coming out of the Getrag. Then to 4th in the SM420 for direct. I already have about 5 of these laying around and I work in a shop where we are constantly building/rebuilding driveshafts so that won't be an issue. I'll have to rig up a bearing for the front of the input shaft on the SM420 but I think it'll work for me.
Depending on your hp range I donít think the 420 is a good idea. They are plenty strong for a small block Chevy and plenty of guys have broken them behind a 454 now with the torque of a 5.9 I would be worried especially with the torque multiplication of your factory trans. But still, sounds like a cool project Iím interested to see how it works out.
01-15-2020 08:39 PM
RustyRedneck
Quote:
Originally Posted by bikerz View Post
Just ran into this thread and had a thought (happens once in a while)...you don't mention what your application is for the truck. Are you hauling all the time and what kind of weight? For all the potential modification you're talking about, although fun to do, is there a simpler path? I haul intermittently up to about 16K and hated the Getrag, especially 3-4, so when I rebuilt I went with a Southbend clutch and GearVendor OD. 'Course it required cutting the driveline, and the GV won't work in 4WD, but it works 100% better for what I do (farming mostly, hauling equipment and product). I also find it great when I'm not hauling and on the hiway, it is smooooth in 5th OD at 75mph (4.11 gears). Oh, '93 W250 with mild changes including slightly larger injectors, pump bump and turbo adjustment. As I said...just a thought.
I think I have decided on an easier way. I think what I'm going to do instead of a 10 speed which is out of my price range, is install a 4 speed Muncie SM420 behind the Getrag 360. I'll primarily be using 3rd and 4th in the SM420. If my Math is correct, 3rd should essentially split my gears in half coming out of the Getrag. Then to 4th in the SM420 for direct. I already have about 5 of these laying around and I work in a shop where we are constantly building/rebuilding driveshafts so that won't be an issue. I'll have to rig up a bearing for the front of the input shaft on the SM420 but I think it'll work for me.
11-24-2019 12:55 PM
ofelas.5z Why bother with two 5 speeds glued together?

Friends don't let friends use synchros.

Synchros are only acceptable on air splits.

Float a 13 speed's physical shifts & have fun.

Real trucks use transmissions that don't have to spool the turbo/s between shifts, but that's a story for another day.
11-24-2019 01:35 AM
bikerz Just ran into this thread and had a thought (happens once in a while)...you don't mention what your application is for the truck. Are you hauling all the time and what kind of weight? For all the potential modification you're talking about, although fun to do, is there a simpler path? I haul intermittently up to about 16K and hated the Getrag, especially 3-4, so when I rebuilt I went with a Southbend clutch and GearVendor OD. 'Course it required cutting the driveline, and the GV won't work in 4WD, but it works 100% better for what I do (farming mostly, hauling equipment and product). I also find it great when I'm not hauling and on the hiway, it is smooooth in 5th OD at 75mph (4.11 gears). Oh, '93 W250 with mild changes including slightly larger injectors, pump bump and turbo adjustment. As I said...just a thought.
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