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Jul 21st, 2025 | | | | Joined: Dec 2006 Posts: 321 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 321 | HI Stovebolters... I am getting into another AD style truck project and I have found a company that makes what looks like a bolt on overdrive for the stock SM420 4 speed transmission. I have had 5 speeds for many years now and they do help in the top end of things...I know a T5 swap might be a good deal to but there seems to be a lot work to get it done....T5's in my neck are non-existence so a ebay find will be about the only option... So has anybody run one of these...??? http://high-impact.net/rangeroverdrive/Any insight would be an awesome thing... MikeC
Last edited by mikec4193; 09/19/2017 5:29 PM.
1951 Chevy 3800 1-TonHoward KnappIn the Stovebolt Gallery1948 Chevy 1-Ton (sold Nov 2017)1953 Chevy 1-Ton (sold 10/1/2016) | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | What year and size truck?
What drivetrain is in it now (engine, transmission, driveshaft, and rear end)? | | | | | Joined: Apr 2010 Posts: 436 'Bolter | | 'Bolter Joined: Apr 2010 Posts: 436 | Looks interesting. I don't think it would work in my '62. I have an X-Frame and can't move the cross member back as is required. Looks like it would work well in a Ladder Frame though. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Been around for years, Advance Adapters also makes them, Paso Robles, CA, never heard anything bad about them.
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: Dec 2006 Posts: 321 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 321 | What year and size truck?
What drivetrain is in it now (engine, transmission, driveshaft, and rear end)? The truck right now is 1948 1 ton...the chassis it is going on is a 1984 C10 1/2 ton with a gear set of 3.73's, the engine is either going to be a 1974 235 cubic in 6 cylinder or a 4.3 liter out of a 1987 S10....the only transmission I have so far is the stock SM420 4 speed with a creeper 1st gear....I was debating doing the S10 T5 speed but so far have not found anything local to pick from... MikeC
Last edited by mikec4193; 09/20/2017 1:41 PM.
1951 Chevy 3800 1-TonHoward KnappIn the Stovebolt Gallery1948 Chevy 1-Ton (sold Nov 2017)1953 Chevy 1-Ton (sold 10/1/2016) | | | | | Joined: Oct 2016 Posts: 916 'Bolter | | 'Bolter Joined: Oct 2016 Posts: 916 | Heavens to Murgatroyd, if you are going with an C-10 chassis & rear end, why would you want to drop a SM420 in it? Or a 235 for that matter...
It's not a '48 1 ton after that swap, so no point in keeping the SM420 or the 235. I don't think they built a 235 in 1974 either.... set the bourbon down and get yourself a modern engine and tranny; that's way too much work to put into a mod project, and then end up keeping that cranky, old drivetrain!
~ Dave
1950 Chevrolet 3600 3/4-ton with 261 engine & T5 Transmission
| | | | | Joined: Feb 2001 Posts: 1,094 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,094 | Probably meant a 230/250 engine from 1974. If that or the 4.3 v6, or any small block with a 700R4 automatic/with overdrive. It will all bolt into an 1984 C-10 frame, it came that way from the factory.
Tommy
59 apache 1/2t
261 short stepside
| | | | | Joined: Dec 2006 Posts: 321 'Bolter | | 'Bolter Joined: Dec 2006 Posts: 321 | Probably meant a 230/250 engine from 1974. If that or the 4.3 v6, or any small block with a 700R4 automatic/with overdrive. It will all bolt into an 1984 C-10 frame, it came that way from the factory. I picked up a late 1990's NV3500 5 speed for it....still hoping the 4.3 will be a good choice...trying to figure out a set of hanging pedals for it now...was trying to do a hodge podge from something newer .....thinking an aftermarket might be a better set up in the long run...trying to save money on these truck builds will bite in the butt every time... Thanks for all the insight....you guys are awesome... MikeC
1951 Chevy 3800 1-TonHoward KnappIn the Stovebolt Gallery1948 Chevy 1-Ton (sold Nov 2017)1953 Chevy 1-Ton (sold 10/1/2016) | | |
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