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pvfjr #1159623 Sun Apr 10 2016 11:04 PM
Joined: Dec 2002
Posts: 2,654
S
'Bolter
Is the tranny in your 55.2 Chevy 6400, or another truck ?


Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
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1950 GMC 250 1-Ton
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pvfjr #1159633 Sun Apr 10 2016 11:55 PM
Joined: Jun 2011
Posts: 4,650
E
'Bolter
The problem with any 5 speed OD trans, is to make 5th OD in the direct 4th gear position, is they make OD the 3rd gear position, so there is a tremendous gap between 2nd and 4th, with a load, one cannot frequently make that jump to 4th., unless a two speed rear, so one is 2nd gear bound until the road levels out.

Makes it even worse with the closer ratio gears required with a diesel. On my 1 ton KB-5 with a 345, I changed out the trans to a direct 5 speed and changed the diff. ratio, much more useable setup.

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.
spanky #1159638 Mon Apr 11 2016 12:33 AM
Joined: Mar 2016
Posts: 171
P
pvfjr Offline OP
'Bolter
Originally Posted by spanky
Is the tranny in your 55.2 Chevy 6400, or another truck ?

Yeah, so far that's the only old iron I have.

pvfjr #1159714 Mon Apr 11 2016 08:10 AM
Joined: Jan 2008
Posts: 4,841
C
'Bolter
The old Clarks had the shift pattern you posted. The good thing about them was that if you got stuck, you could go back and forth from 1 to R and try to rock yourself out. Overdrives were very rare. Chances are good you have a direct.

crenwelge #1160503 Fri Apr 15 2016 06:40 AM
Joined: Mar 2016
Posts: 171
P
pvfjr Offline OP
'Bolter
Well I managed to rid the truck of its infestation related debris and get the old carpet out. The tranny tunnel came out without too much fuss. From the top, the tranny looks even more like the 205/207 case. I wonder if there were any castings or stampings that would differentiate them. I do see a couple castings in the new photos toward the end of the album, but don't know what they signify.
5 speed pics

pvfjr #1160656 Sat Apr 16 2016 01:25 AM
Joined: Jan 2008
Posts: 4,841
C
'Bolter
Casting numbers won't do much good because the direct and OD are built in the same case. 50 years ago it was common to change a few gears in a Clark and make an OD out of it. GMC would have a line set inside the glove box door. I don't know much about Chev. If all else fails put it where 4th would be on a direct.



2 4 R
|_|_| Direct Drive 5th
| | |
3 5 1

Turn the input shaft. If the output goes slower than the input, you have a direct. If it goes faster, you have an overdrive.

pvfjr #1468486 Tue Sep 27 2022 02:14 PM
Joined: Jun 2011
Posts: 4,650
E
'Bolter
4 shift rails and Al top cover sure clues. 540 series as well as 465’s are all easy to downshift into low, just practice.

Ed

Last edited by EdPruss; Thu Sep 29 2022 10:38 PM.

'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.
pvfjr #1468883 Thu Sep 29 2022 10:13 PM
Joined: Sep 2011
Posts: 1,195
B
'Bolter
Does have provision for PTO on both sides which the NP540 has.

Last edited by BC59; Thu Sep 29 2022 10:14 PM.

BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
EdPruss #1468908 Fri Sep 30 2022 01:16 AM
Joined: Mar 2004
Posts: 5,723
M
'Bolter
Originally Posted by EdPruss
4 shift rails and Al top cover sure clues. 540 series as well as 465’s are all easy to downshift into low, just practice.

Ed

You do realize this is a 6 year old thread, right?

Mike B smile

pvfjr #1468921 Fri Sep 30 2022 04:12 AM
Joined: Sep 2011
Posts: 1,195
B
'Bolter
Still working on days of the week, now you want me to notice the year?


BC
1960 Chevy C10 driver 261 T5 3.73 dana 44
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
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