5 speed gmc transmission , will it fit?

[jonzcustomshop]

I was talking to an old salvage yard guy about my gmc 4000 series, he mentioned that if it had a 5 speed that Icould bolt it into my 1/2 ton..
so I checked and it is the np540go14! thats the 5 speed overdrive!
I copied some info from the www.6066gmcguy.org/ website on it

anyone hear of bolting one of these into a 1/2 ton with a sbc?

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5-Speed Transmissions
GMC Used New Process, Clark & Spicer 5-Speed Transmissions in the 4000 series & bigger
Trucks. The New Process NP-540 series of 5 speed transmissions came in a few different models.
The "GL" is Pictured below & the others will look the same. The "GO" was an overdrive model,
the other models just had some different gear sets in them for the lower gears, see charts below.
The NP-450-GL was mounted behind a 401M in a 1963 4000 model, not stock running gear
for that truck, you will note that the trans top cover has a back up light switch, which came
out in 1967. This trans will be used in my 1965 GMC 1 ton with the 401M for power.





Transmission Specifications
GMC Used the follwoing Four & Five Speed transmissions.

Manufacturer Transmission 1st
2nd
3rd
4th
5th
Rev
Oil Capacity




General Motors/Muncie SM-465 6.54:1 (this is the one in the truck now)
3.57:1
1.70:1
1.00:1

6.54:1
6 pints


New Process 540GO14 6.05:1 this is the 5spd od in my gmc 4000)
3.31:1
1.84:1
1.00:1
0.82:1
6.86:1
10 pints