New member. a couple questions... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

will2k2 · 05-06-2004, 10:55 PM

Hey everyone...

I just bought a 1975 Cheyenne LWB. It was cheap but runs well and isn't in too bad of shape.

Problem #1:

The column(automatic) shifter has an amazing amount of slop in it. I can't always get Park and the other gears aren't easy either. I looked at the external linkage and it appears fine.

Problem #2, which might be related.

The TH350 seems to work well, and doesn't slip or leak. However, I can't get reverse going down with the shifter. I have to pass it, and get it coming up toward park, lol. The trans also occasionally shifts from 3rd to 2nd, on it's own, at part throttle. It shift down, shift up, shift down again, and so on. Everyonce in a while it will stay in second.

The shifts are firm and the modulator and downshift cable are connected. The shifts come on time, both accelerating and slowing to a stop, so I wonder if it's mainly a linkage problem.

Problem #3.

The temp gauge, ammeter and fuel gauges are all inoperative. The oil pressure gauge works. When I switch the lights on the temp gauge goes to full hot. Any ideas before i dig into it?

Thanks for the help!

Low87 · 05-07-2004, 08:21 AM

Welcome to the board!

Blue Beard · 05-07-2004, 08:24 AM

Welcome from SW Washington State...

gldevall · 05-07-2004, 09:37 AM

Welcome. As for question #3, it sounds like a ground problem in the cluster somwhere.

Cole's 87 · 05-07-2004, 09:55 AM

Welcome to the board...... Looks like the guys already got your problems diagnosed. As you can see you will be in good hands with these guys helping you out. I know they helped me a bunch.

Prerunner1982 · 05-07-2004, 10:32 AM

welcome, .......

the up shift, down shift, up shift..... could be part of a common problem, called wandering. as far as i know its just something that all th350s do. the "elders" will know more about that.

05-07-2004, 09:37 AM	#4
gldevall Registered User Join Date: Mar 2003 Location: Walker, LA Posts: 2,925	Welcome. As for question #3, it sounds like a ground problem in the cluster somwhere. __________________ Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels

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05-06-2004, 10:55 PM	#1
will2k2 Registered User Join Date: May 2004 Posts: 5	New member. a couple questions... Hey everyone... I just bought a 1975 Cheyenne LWB. It was cheap but runs well and isn't in too bad of shape. Problem #1: The column(automatic) shifter has an amazing amount of slop in it. I can't always get Park and the other gears aren't easy either. I looked at the external linkage and it appears fine. Problem #2, which might be related. The TH350 seems to work well, and doesn't slip or leak. However, I can't get reverse going down with the shifter. I have to pass it, and get it coming up toward park, lol. The trans also occasionally shifts from 3rd to 2nd, on it's own, at part throttle. It shift down, shift up, shift down again, and so on. Everyonce in a while it will stay in second. The shifts are firm and the modulator and downshift cable are connected. The shifts come on time, both accelerating and slowing to a stop, so I wonder if it's mainly a linkage problem. Problem #3. The temp gauge, ammeter and fuel gauges are all inoperative. The oil pressure gauge works. When I switch the lights on the temp gauge goes to full hot. Any ideas before i dig into it? Thanks for the help! __________________ 1975 Cheyenne 350 2bbl, TH350, 3.42 rear. Rosewood/white insert

05-07-2004, 08:21 AM	#2
Low87 been here longer than Liz Join Date: Feb 2000 Location: Broken Arrow, OK Posts: 2,437	Welcome to the board! __________________ ~Greg~ Mac's Garage '87 SWB 6/8 drop "Piso" '08 CCSB Silverado DD the departed '89 GMC K5 Jimmy 4x4 "Rusty Nuts" '77 Chevy K5 Blazer 2wd '83 Chevy stepside "You get what you pay for" - Mike 'swervin ervin' Ervin

05-07-2004, 08:24 AM	#3
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	Welcome from SW Washington State... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

05-07-2004, 09:55 AM	#5
Cole's 87 Registered User Join Date: Nov 2002 Posts: 272	Welcome to the board...... Looks like the guys already got your problems diagnosed. As you can see you will be in good hands with these guys helping you out. I know they helped me a bunch.

05-07-2004, 10:32 AM	#6
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	welcome, ....... the up shift, down shift, up shift..... could be part of a common problem, called wandering. as far as i know its just something that all th350s do. the "elders" will know more about that.



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