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Jul 21st, 2025 | | | | Joined: Jan 2018 Posts: 294 'Bolter | | 'Bolter Joined: Jan 2018 Posts: 294 | Posting this for a friend. 1949 5 window, 235. Wants to take out original tranny and enclosed drive line. Will a 1972 4 speed crawler bolt up to bell housing? If not what year tranny's will work to gain on highway speed and take out enclosed drive shaft. Thanks for any help with this.
1937 GC
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | 420 and 465 are direct in high, T-5’s have several gear sets available with OD, important to get proper gear set to match use, existing gear ratio, tire size, loads hauled, mountains or not, etc.
Easy conversion
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: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The T-5 5 speed from an S-10 pickup or Camero is the best way to go. There is gobs of info on this swap in this website. Do a search & look in theTech-tips.
George
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jan 2018 Posts: 294 'Bolter | | 'Bolter Joined: Jan 2018 Posts: 294 | I finished my resto of a 37 last spring and did do a t-5 install so I am familiar with putting one in. Had a new rear end built with 350 ratio so goes down the road real nice. I will try to talk my friend into t-5 but not sure if he will do it. As I asked in my first post will a 72 tranny bolt up easily to a 49 235? I am Not sure what a 420 or 465 trans. are. I think he has a 72 on hand and would like to install it. Thanks for any and all help..Bill
1937 GC
| | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | SM420 and SM465 are Chevy truck trannys. (4 speed, shifter on top, granny 1st gear). Neither one will make it go faster ad they are straight through on 4th gear. Novaks has a lot of info for identifying your trans. Below is a link to the SM465, which was used in 1972 in 4 speed trucks with the granny 1st gear https://www.novak-adapt.com/knowledge/transmissions/manual/sm465 | | | | | Joined: Jan 2018 Posts: 294 'Bolter | | 'Bolter Joined: Jan 2018 Posts: 294 | Thank you for the info. Will show to owner of the 49
1937 GC
| | | | | Joined: Apr 2005 Posts: 2,066 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,066 | The mounting pattern is the same from 48 up but the SM465 trans has a larger diameter bearing retainer which will not match up with the center hole in the 49 bellhousing.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The SM 420 was used from 48 to 67. The SM465 was used from 68 to about early 90,s. with various changes.
The only way you can decrease the engine rpm at highway speeds is an o-drive trans. or higher gear rear end.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 | This is outside of my limited area of experiences - so please excuse my ignorance/boldness in asking the following questions, and, please excuse my ignorance in offering some suggestions. If the questions/information posted below are incorrect and/or are totally "off base", I will delete this post. Will you have a 1958-1964 10 bolt rear end? If yes, do you want to convert it to a 3.55 Ring & Pinion gear set? If yes, might the items in the next two links be helpful? - 3.55 R & P set- 3.55 R & P installation parts-set | | | | | Joined: Jan 2018 Posts: 294 'Bolter | | 'Bolter Joined: Jan 2018 Posts: 294 | The owner is putting in a newly built fo#d 9" from John's Industries with a 305 or something near that for gears. Also new drive shaft to match up to the sm465.
The truck is at John's and they are doing the install. Thanks for all the info with this. Bill
1937 GC
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | With rear gears that high and a 1:1 (direct drive) SM-465 I'm not sure the 235 will be up to the task. Originally that truck would have had 4.10 rear with 1:1 transmission and the 235 worked well. Essentially the only thing you've changed is the rear to 3.05 and now the engine is way underpowered. Mike B  | | | | | Joined: Sep 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,363 | With rear gears that high and a 1:1 (direct drive) SM-465 I'm not sure the 235 will be up to the task. Originally that truck would have had 4.10 rear with 1:1 transmission and the 235 worked well. Essentially the only thing you've changed is the rear to 3.05 and now the engine is way underpowered. Mike B Perhaps some really small tires!
Last edited by BC59; 12/19/2020 5:03 AM.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Ford 9” diffs. are easy to switch, might be worthwhile to look for an optional ratio to try switching out to get optimum ratio, loaner from diff. shop?
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: Jan 2018 Posts: 294 'Bolter | | 'Bolter Joined: Jan 2018 Posts: 294 | I'm glad that this is not my project! As I said I finished my 37 resto with t-5 and am very happy. 1800 rpm at 55 mph..350 rear gears
1937 GC
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