Does anyone know what tranny is a direct replacement - The 1947 - Present Chevrolet & GMC Truck Message Board Network

luckylindy6 · 09-19-2020, 10:17 PM

I have a 1965 c10 4 on the floor and am wanting a better driver
Quality 4 speed trans that would be a bolt in... i can do most work
Myself but not into having to do real fab work but want something
That is a better driver... no granny gear and syncros

**jocko** · 09-19-2020, 11:45 PM

If you don't abuse it, a T5 is a very nice swap. Some T5s do have a deep 1st gear, but less than half a granny. The overdrive is worth the work. I basically used 2nd-5th and it was a great driver.

**Captainfab** · 09-20-2020, 11:00 PM

Just what do you mean by a 'better driver"? Does your truck currently have the SM420? If you want lower rpm's on the highway, no 4 speed is going to accomplish that. You will need a 3 speed with OD, a 5 or 6 speed.

Sevens · 09-21-2020, 12:13 AM

I've been working on figuring this out myself.

I love the 4 speed (SM420) most of the time...

1st is useless unless you are trying to pull a house, and I don't like how big the jump is between 2nd and 3rd....

AcampoDave · 09-21-2020, 01:15 AM

There are a few 4 speeds that will bolt up, but there are hidden costs and slight modifications involved. The Saginaw 4 speed is good for mild to moderate use. The Borg Warner (now Richomd) Super t10 is being remanufactured and will hold up better than the Saginaw, and like the t10, The Muncie, which is very strong, is also being reproduced. All of these trannys require a shifter such as a Hurst. For ideal results the rear axle and tire size are important considerations because all 3 of the trannys I named are available in various gear ratios. Numerically higher rear ends use a tranny with a numerically lower first gear. Trannys with a numerically lower first gear have a tighter gear spread. As the rear end becomes more highway oriented (numerically lower) the gear spread needs to be wider because you need to start lower and space the steps out to overcome the tall rear gear. I bought a Muncie from https://5speeds.com/ they have a lot of good info on their website. It wasn't exactly cheap, (about the same price as my motor) but it's exactly what I wanted.

**The Rocknrod** · 09-21-2020, 07:00 AM

Mother of God. I just looked up those prices, the last time I purchased a T10 from a wrecking yard near San Diego it was $90. Times have sure changed. :O

09-19-2020, 10:17 PM	#1
luckylindy6 Registered User Join Date: Sep 2009 Location: Central point, Or Posts: 11	Does anyone know what tranny is a direct replacement I have a 1965 c10 4 on the floor and am wanting a better driver Quality 4 speed trans that would be a bolt in... i can do most work Myself but not into having to do real fab work but want something That is a better driver... no granny gear and syncros

09-19-2020, 11:45 PM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,975	Re: Does anyone know what tranny is a direct replacement If you don't abuse it, a T5 is a very nice swap. Some T5s do have a deep 1st gear, but less than half a granny. The overdrive is worth the work. I basically used 2nd-5th and it was a great driver.

09-20-2020, 11:00 PM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Does anyone know what tranny is a direct replacement Just what do you mean by a 'better driver"? Does your truck currently have the SM420? If you want lower rpm's on the highway, no 4 speed is going to accomplish that. You will need a 3 speed with OD, a 5 or 6 speed. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

09-21-2020, 12:13 AM	#4
Sevens Registered User Join Date: Dec 2019 Location: Sacramento, CA Posts: 99	Re: Does anyone know what tranny is a direct replacement I've been working on figuring this out myself. I love the 4 speed (SM420) most of the time... 1st is useless unless you are trying to pull a house, and I don't like how big the jump is between 2nd and 3rd.... __________________ -Tim '65 GMC that identifies as a Chevrolet

09-21-2020, 01:15 AM	#5
AcampoDave Registered User Join Date: Feb 2013 Location: central California Posts: 2,780	Re: Does anyone know what tranny is a direct replacement There are a few 4 speeds that will bolt up, but there are hidden costs and slight modifications involved. The Saginaw 4 speed is good for mild to moderate use. The Borg Warner (now Richomd) Super t10 is being remanufactured and will hold up better than the Saginaw, and like the t10, The Muncie, which is very strong, is also being reproduced. All of these trannys require a shifter such as a Hurst. For ideal results the rear axle and tire size are important considerations because all 3 of the trannys I named are available in various gear ratios. Numerically higher rear ends use a tranny with a numerically lower first gear. Trannys with a numerically lower first gear have a tighter gear spread. As the rear end becomes more highway oriented (numerically lower) the gear spread needs to be wider because you need to start lower and space the steps out to overcome the tall rear gear. I bought a Muncie from https://5speeds.com/ they have a lot of good info on their website. It wasn't exactly cheap, (about the same price as my motor) but it's exactly what I wanted.

09-21-2020, 07:00 AM	#6
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Does anyone know what tranny is a direct replacement Mother of God. I just looked up those prices, the last time I purchased a T10 from a wrecking yard near San Diego it was $90. Times have sure changed. :O __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?



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