I'd replace those small lines that go from the shifter to the trans. they get gunked up over the years. You could check the pressure on them. I forget what they call for right now though and I'm not near a manual.
get used to that smoke, all the big cams do that.
go find pitsburg powers website. they have lots of technical articles written about big cams. there parts are overpriced but there is lots of info there
1988 377 with cummins big cam
Discussion in 'Trucks [ Eighteen Wheelers ]' started by alien4fish, Dec 20, 2008.
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when i finally get that truck in my driveway i will be able start the long process of bringing her back to where she used to be.thats what i was thinkin too about gunk being trapt in those air lines. thanks for the heds up on the website i will be sure to bookmark it and read up on that motor
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Sorry Alien the way you explained that I thought you was trying to run it like a 13spd...lol
Are you talking when you try to go from the high side to the low side it won't drop down real fast? In other words it won't just click into the low side? If so does it have that sound like its trying to find the spot to go in almost like its rolling around in there? -
yeah you know when you're up high range and you flip the blue forward and it shifts up while in the hole then flip the switch back to preselect and then kick the stick out to go the next hole thats when it tumbles around and wont go in to gear i tryed revin it high and just bumpin the throttle and it wont go .......so i had to pull over like a rookieLOL and start over. Now it will "split" up and down while its in the hole and it works that wayjust having a problem when i preselect .........other than that it shifts fine, it does need a clutch brake too i remember that let me know what you think les2 im pretty sure im doin it right but ya never knowLOL
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The blue button should only work in low range. When your in high range that button shouldn't be able to move. Thats where im getting confused here...lol
If your talking splitting low side gears you don't do that with a 15spd.
Wait I think I know what your talking about.....So the deep reduction splitter will split as long as its in gear but when you take it out it just rolls around? If thats the case it can be several things.... the valve is old and wore out, the synchronizers are bad, or just gunked up from sitting. Best way to tell is get the tranny warm and see if it still does it.Last edited: Dec 22, 2008
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les there is two kinds of 15 speeds. one is the deep reduction like you are talking about an then there is a 15 that splits the top. One has that goofy reversed shift pattern where high gear is up against the dash and the other has a nomal pattern
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If it has the blue button its a deep reduction. I've never seen a 15spd that split on the top side. I did hear once from a guy who had an old pete with a KTA600 in it that said he had a 20spd in it. I don't know if it was a 2 stick of some sort but they said he had to put it in cause he kept breaking the 15 that he had??
Rumor had it that he was putting 1000hp to the ground? -
The best thing is to get the transmission number off the side of the transmission. Then we can know what you have, and how it must shift.
I have never seen a 15 speed that you split the gears. You select deep reduction, change 1 through 5, next per-select, shift back to 4th, shift to 5th, change range selector, shift 6 through 10. -
But I do wonder why they never made one with deep reduction, low, and high/OD? That would make a 20spd but would probably be heavy as heck and expensive.
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