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59 trans length.
#1407397 Sun Apr 25 2021 01:58 PM
Joined: Jul 2014
Posts: 27
C
Camino Offline OP
'Bolter
My 59 is a 3 speed. Neighbor has an sm425 4 speed. If I use the 4 speed do I need a different driveshaft ?

Re: 59 trans length.
Camino #1407410 Sun Apr 25 2021 03:22 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
If you are referring to the SM420 (granny gear 4 speed) the answer is yes.
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
Re: 59 trans length.
Camino #1407431 Sun Apr 25 2021 07:02 PM
Joined: Jun 2011
Posts: 4,122
E
'Bolter
If a 465, also need new driveshaft.

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.
Re: 59 trans length.
Camino #1407511 Mon Apr 26 2021 01:38 PM
Joined: Jul 2014
Posts: 27
C
Camino Offline OP
'Bolter
Yes a 420. Thanks guys. I was afraid of that.

Re: 59 trans length.
Camino #1407531 Mon Apr 26 2021 03:20 PM
Joined: Apr 2005
Posts: 1,865
R
'Bolter
The SM420 is a good HD trans and would be great for hauling loads but is no improvement for normal driving.
If you are looking for better highway speeds, install an overdrive. The SM319 is a factory overdrive, it is a bolt in and no driveshaft or any other mods are needed. There are electrical components and a cable but that's it.
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

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