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Anyone Familiar with These Transmissions ?

Posted By C10 - C90 Bill 3 Years Ago
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glenn akers
Posted 3 Years Ago
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6th Direct

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There is two things that will break the pins in the syncros and that is backing up and ranging it or a drive line virbration due to many different things.

Glenn Akers
Geoff Weeks
Posted 3 Years Ago
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13th direct

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If you have a lo-hi syncro, you can see how the springs go in, if it was turning backward when in use (like in rev) it would tend to make it want to come apart. When you assemble, you push it together and turn.  That is why the tell you not to range shift going backwards.
Brocky
Posted 3 Years Ago
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13th direct

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Bill
I have done it too!! But just too damn fast!!!

Brocky
C10 - C90 Bill
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Which reminds me.  Why do they say not to Shift from Low Range to High Range in Reverse on a 10-Speed RR?  I did try it once though and it worked pretty good.  Although once you shift, it really takes off, lol. 

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Geoff Weeks
Posted 3 Years Ago
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13th direct

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I think the problem is, the only way to do that and make it work, is to syncro the splitter gears. If you notice, on the shift labels you attached, there is a warning on the RT one not to shift to low range from 5th under. If you had the range try and shift the same time as the splitter you'd break the quill shaft.
Tony Bullard
Posted 3 Years Ago
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13th direct

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"To get back to the underdrive 13, if they had made it such that the splitter control was reversed and it automatically went to 6 UD when you made the rage shift from low, no one would know the difference between it and a 13 over."

Exactly what I was thinking.


Tony
Geoff Weeks
Posted 3 Years Ago
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13th direct

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hayseed (11/29/2016)
Geoff Weeks (11/28/2016)


With 3.42's and tall 20" rubber you'd need the U/D 13 to pull any kind of weight. I had  3.42 on low pro 22.5 and it was over geared. I like 3.73's or 3.70's with an RTO 13. I am running 4.11' 2 spd's  with an RTO 15, both on tall 20" rubber.




Geoff, not trying to start Argument, but am willing to debate the Above statement.

This truck (which I still Own) N14@460hp 18speed (single overdrive) Rockwells @ 3.41 on 11R22.5's
Has done very close to 3.4 Million Kms (in excess of 2 Million Miles) Did countless loads like the one Pictured grossing Appox 58000Kgs (127600 Lbs). & stood up to the Work real Good..

http://forums.justoldtrucks.com/uploads/images/d7a57f7a-8f84-439d-8a1d-077a.png


The cabover I started heavy haul'n with started out with 3.42's on lo-pro 22.5's It pulled it but without any to spare. As I updated when the 3.42 just plain wore out, I went with 3.73's  By this time the 9 had become a 13, and the lo-pro's were replaced with 20" spokes, running either 10X20's or 11X22.5's.
 To get back to the underdrive 13, if they had made it such that the splitter control was reversed and it automatically went to 6 UD when you made the rage shift from low, no one would know the difference between it and a 13 over. It was the funky shift pattern that threw people off. The splits and rpm drop between gears was the same. Kind of like an OD 9 speed. if you use the X bar top cover, you can't tell its an OD 9 from a direct 9 because they shift the same. I think the backwards splitter control was why they wern't more popular. As I said before, I was thinking about a 9 over mated to a 13 under back box, still may build one some day if I can find enough donor parts.
chocko
Posted 3 Years Ago
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5th Over

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When I was in USN I do not remember any 5X4 or 4X3 trans being progressive. They were all deep under that i saw. A progressive trans in the long nosed green ones that the Seabees used would not have enough reduction for off road conditions that they work in.The 4X3 trans were in 260 Brockways with 280 Cummins engines,they had some of these in vietnam around Danang. A friend of mine bought one in New Jersey that a Township received surplus. Low mileage around 35,000 not bad for a truck over 50.
hayseed
Posted 3 Years Ago
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5th Direct

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Geoff Weeks (11/28/2016)


With 3.42's and tall 20" rubber you'd need the U/D 13 to pull any kind of weight. I had  3.42 on low pro 22.5 and it was over geared. I like 3.73's or 3.70's with an RTO 13. I am running 4.11' 2 spd's  with an RTO 15, both on tall 20" rubber.




Geoff, not trying to start Argument, but am willing to debate the Above statement.

This truck (which I still Own) N14@460hp 18speed (single overdrive) Rockwells @ 3.41 on 11R22.5's
Has done very close to 3.4 Million Kms (in excess of 2 Million Miles) Did countless loads like the one Pictured grossing Appox 58000Kgs (127600 Lbs). & stood up to the Work real Good..

http://forums.justoldtrucks.com/uploads/images/d7a57f7a-8f84-439d-8a1d-077a.png



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C10 - C90 Bill
Posted 3 Years Ago
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Third Gear

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What puzzles me is the Shifting Sequence Plate that I posted on Page 1.  I would find it hard to believe that GM would make up a plate like that just for that one particular truck.  It looked to me like it was just one of a few optional combinations, even as rare as it might have been. 

What would y'all say ?






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'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan


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