won't downshift above 45mph....is this normal? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jason71k10 · 03-17-2003, 09:38 PM

I have a 350/th350 combo in my k-10 with pretty much stock engine, except exhaust. If i'm going 40-45 mph on flat ground, it gears down to 2nd, no problem, but any faster than that or if i'm going up hill, it won't gear down, even though the rpm's aren't that high.
Is this normal?? i'm kinda new to automatics, so i'm not sure.
The tranny was rebuilt about 10k miles ago. Thanks for any hepl guys.

Jason

tom hand · 03-17-2003, 10:09 PM

Have you adjusted the downshift cable? It is a very simple adjustment, but kinda hard to describe. There are two clips behind the bracket that holds the cable. You unsnap the clips, mash the pedal the floor, and snap them back. Takes all of two minutes. If you look at a service manual, I'm sure it would have some pics to make what I just said a lot more clear

Jason71k10 · 03-17-2003, 10:12 PM

Thanks tom hand. I don't have a service manual(yet), but I have a haynes manual.....is it in there? I assuming that this isn't normal then?

72MARIO · 03-17-2003, 10:34 PM

Should be in the Haynes manual somewhere Don't drive it too hard till it gets fixed you could burn out the tranny. When you hear it needs to drop to the lower gear drop it down at the coloum.

I have not talked to Bill yet either. I will let you know one night this week. Roofing has started up full time know so trying to get in touch with Bill could be tough! today was sooo nice Eh ? I got a sun Burn too.
Later Dude.

Jwill41 · 03-17-2003, 11:08 PM

Eh? inside joke LOL

Longhorn Man · 03-18-2003, 12:06 AM

Actually a TH350 will live forever even with the cable disconnected. It is the over drives that die from misadjusted cables.
Your kick down cable is most likely at fault. Onless they shop put a govenor assembly out of a deisel in there...then the kick down won't do anything to overcome the govenor.

Jason71k10 · 03-18-2003, 12:53 AM

thanks guys. I'll adjust the cable tomorrow, and let you know how i made out.

Jason

03-17-2003, 09:38 PM	#1
Jason71k10 ready for reassembly Join Date: Jun 2002 Location: Barrie ONT, Canada Posts: 413	won't downshift above 45mph....is this normal? I have a 350/th350 combo in my k-10 with pretty much stock engine, except exhaust. If i'm going 40-45 mph on flat ground, it gears down to 2nd, no problem, but any faster than that or if i'm going up hill, it won't gear down, even though the rpm's aren't that high. Is this normal?? i'm kinda new to automatics, so i'm not sure. The tranny was rebuilt about 10k miles ago. Thanks for any hepl guys. Jason

03-17-2003, 10:09 PM	#2
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Have you adjusted the downshift cable? It is a very simple adjustment, but kinda hard to describe. There are two clips behind the bracket that holds the cable. You unsnap the clips, mash the pedal the floor, and snap them back. Takes all of two minutes. If you look at a service manual, I'm sure it would have some pics to make what I just said a lot more clear __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

03-17-2003, 10:12 PM	#3
Jason71k10 ready for reassembly Join Date: Jun 2002 Location: Barrie ONT, Canada Posts: 413	Thanks tom hand. I don't have a service manual(yet), but I have a haynes manual.....is it in there? I assuming that this isn't normal then? __________________ stock 71 4x4 2003 Jeep Liberty, rocky mountain edition I'm obsessed, and wouldn't have it any other way!

03-17-2003, 10:34 PM	#4
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Should be in the Haynes manual somewhere Don't drive it too hard till it gets fixed you could burn out the tranny. When you hear it needs to drop to the lower gear drop it down at the coloum. I have not talked to Bill yet either. I will let you know one night this week. Roofing has started up full time know so trying to get in touch with Bill could be tough! today was sooo nice Eh ? I got a sun Burn too. Later Dude. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

03-17-2003, 11:08 PM	#5
Jwill41 Registered User Join Date: Aug 2002 Location: Farmers Branch, Tx Posts: 1,009	Eh? inside joke LOL __________________ http://www.picturetrail.com/jwill41 67 1/2 ton GMC short step side 68 1/2 ton Chevy long fleet side 72 1/2 ton Chevy Suburban 99 1/2 ton Chevy Suburban founder (and only member) of the primer/clearcoat club

03-18-2003, 12:06 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Actually a TH350 will live forever even with the cable disconnected. It is the over drives that die from misadjusted cables. Your kick down cable is most likely at fault. Onless they shop put a govenor assembly out of a deisel in there...then the kick down won't do anything to overcome the govenor.

03-18-2003, 12:53 AM	#7
Jason71k10 ready for reassembly Join Date: Jun 2002 Location: Barrie ONT, Canada Posts: 413	thanks guys. I'll adjust the cable tomorrow, and let you know how i made out. Jason __________________ stock 71 4x4 2003 Jeep Liberty, rocky mountain edition I'm obsessed, and wouldn't have it any other way!

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