I want a 4 speed!!!! I WANT! I WANT! I WANT! - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 04-10-2009, 09:54 AM Thread Starter
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I want a 4 speed!!!! I WANT! I WANT! I WANT!

I am so tired of my silverados being automatic... what is a good heavy duty 4 speed?

97 Ram 3500 2wd dually 12v ff #0 fuel plate, upgraded compressor wheel, nv 4500 rock crusher, 4.10 rear gooseneck & 5th wheel hitch... also has access to underbed repo wheel lift

94 Chevy silverado Blazer 4X4, 350, 700r4, sound system from hell... still drive the dodge mostly

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post #2 of 9 (permalink) Old 04-10-2009, 12:55 PM
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gm's 465 tranny was likely the toughest tranny ever put in a pickup. you could find them in[ not exact on years span] 70's to early 90 gm 3/4 and one ton trucks. they will make a truck a real truck! this being said, i would also look into a nv4500, very similar tranny, just has the benifit of an od.. the 4500 will cost more coin however..
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post #3 of 9 (permalink) Old 04-10-2009, 02:06 PM
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Are you talking about for the 90 2500? A 465 would definately be the wany to go on a 4spd,in fact it's the only way to go. You will need an 81-91 with a 32spline rear output.

01 2500 Duramax/ZF6,returned to daily driver590/995
03 3500 Duramax/Ally S/C IV EFI Live {Brothers truck}
04 3500 Duramax/Ally EFI Live,feed truck with 3 bale Hydra-Bed,very sick trans
06 4500 Duramax/Ally 4x4 Monroe,EFI Live,Danville turbo, CM flatbed
11 2500 Duramax/Ally 4x4 H&S tuned and deleted {GF's truck}
13 3500 Duramax/Ally 4x4 stock for a very short time
Some Green Equipment and a heard of Black Angus cows
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post #4 of 9 (permalink) Old 04-13-2009, 08:00 PM
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the SM-420 4spd manual has been a tried and true design seem to do rather well in my truck i have towed loads as heavy 23K-LB's. . . tho my old GMC V-6 engine only makes [email protected] and [email protected] . .I do believe they also put this trans behind some of the stronger GMC V-6's. . .from 60-74. . .Ido believe this same trans went on to be used with 427's n 454's. . .

Mikey

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1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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post #5 of 9 (permalink) Old 04-14-2009, 01:27 AM
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420's are great IMO too but I was under the impression parts are hard to get and they were only made 1 year to accept a married t-case and that was 1967. I had 2 at one time and sold both. The only t-case that will direct bolt to them is a 221 Rockwell and they have issues .

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Originally Posted by M123KT-450 View Post
the SM-420 4spd manual has been a tried and true design seem to do rather well in my truck i have towed loads as heavy 23K-LB's. . . tho my old GMC V-6 engine only makes [email protected] and [email protected] . .I do believe they also put this trans behind some of the stronger GMC V-6's. . .from 60-74. . .Ido believe this same trans went on to be used with 427's n 454's. . .

Mikey

01 2500 Duramax/ZF6,returned to daily driver590/995
03 3500 Duramax/Ally S/C IV EFI Live {Brothers truck}
04 3500 Duramax/Ally EFI Live,feed truck with 3 bale Hydra-Bed,very sick trans
06 4500 Duramax/Ally 4x4 Monroe,EFI Live,Danville turbo, CM flatbed
11 2500 Duramax/Ally 4x4 H&S tuned and deleted {GF's truck}
13 3500 Duramax/Ally 4x4 stock for a very short time
Some Green Equipment and a heard of Black Angus cows
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post #6 of 9 (permalink) Old 04-19-2009, 02:52 PM
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Sorry i forgot to read the part about using it in a 4x4 sorry. . .

I have had great luck with mine i am just not sure how new they went but i had been told they were around for many years. 195?-198?-9?

Mines been towing heavy loads since 1962 with a 379M-V6 in front of it.
Them Big block V-6's don't seem to give up they just keep towing and towing. . .

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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B.O.M.B Squad #43

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post #7 of 9 (permalink) Old 04-19-2009, 03:38 PM
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The SM420 was last ran in 67 in pickups and replaced by the SM465. Trucks I believe got the 465 around the same time.

01 2500 Duramax/ZF6,returned to daily driver590/995
03 3500 Duramax/Ally S/C IV EFI Live {Brothers truck}
04 3500 Duramax/Ally EFI Live,feed truck with 3 bale Hydra-Bed,very sick trans
06 4500 Duramax/Ally 4x4 Monroe,EFI Live,Danville turbo, CM flatbed
11 2500 Duramax/Ally 4x4 H&S tuned and deleted {GF's truck}
13 3500 Duramax/Ally 4x4 stock for a very short time
Some Green Equipment and a heard of Black Angus cows
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post #8 of 9 (permalink) Old 04-19-2009, 08:18 PM
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I don't know that very well could i was just told it was used in every 4spd manual unit from the mid to late 50's threw the 60's then was only in medium trucks for the 70s+ so i just guess on that ending year. . .

I have got say it is one of the smoothest shifting quitest running 4spd's i know of and tough to. . .

i had the truck about 2 years running the heck out of it when i desided to change the Gear lube in the trans n diff.

It poured out Rusty Brown and was only half full. i was a bit pissed i didn't check it sooner i had spent 2 years towing around 18-22K loads. . .

well it cleaned out after several short run drains and i had been running 80w-140 AMSOIL long life lube.

9 years of syn fluid and no leaks or drips. stays full and is always clean tho i change it every spring now i have just went to the SAE190 gear lube i can't wait to see how it looks this may and SAE250 in the Diff. . .

Mikey

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

AMO #9860

B.O.M.B Squad #43

Dually Club #98

Last edited by M123KT-450; 04-19-2009 at 08:20 PM.
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post #9 of 9 (permalink) Old 09-13-2009, 12:57 AM
 
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I agree with these people!

The SM465 is one of the best 4 speeds out there.Very popular in 2wd or 4wd applications also.Granny gear is something like 6.56:1 but the SM420 is 7.05:1 so it is lower for more pulling capacity.I've got a SM465 behind my 292 in-line six
and it's stout but slow.We're in the process of putting a SM465 behind a 350 ton chevy '73.It was automatic,I hate automatic trucks!!I believe only manual trans. should be offered in trucks especially if their diesel!! Jake
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