TH-400, No reverse, what to check??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rcbildr · 05-12-2010, 01:16 PM

The TH-400 in my diesel burb won't shift in to reverse. Is there anything I can check or is it time for an overhaul? Any help will be greatly appreciated. Thanks!

z3pr68138 · 05-12-2010, 02:23 PM

First thing I check is the trans dipstick. Low fluid or brown and burnt smell are dead give aways.

knightowl73 · 05-12-2010, 06:05 PM

bad thing is 1sr and reverse are the same clutches inside, so most likely if you dont fix it first will be the next gear to go out. has happened to me before but my trans was too far gone and before i could really even try to figure out if it was something simple, 1st went out as well. my dad says its common. when we rebuilt it, clearly the clutches for 1sr gear wear shot. neve had a prob after that.

05-12-2010, 01:16 PM	#1
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	TH-400, No reverse, what to check??? The TH-400 in my diesel burb won't shift in to reverse. Is there anything I can check or is it time for an overhaul? Any help will be greatly appreciated. Thanks! __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

05-12-2010, 02:23 PM	#2
z3pr68138 Registered User Join Date: Mar 2010 Location: Omaha, Ne Posts: 36	Re: TH-400, No reverse, what to check??? First thing I check is the trans dipstick. Low fluid or brown and burnt smell are dead give aways. __________________ 1987 Chevrolet K5 Blazer with 1990 GMC Suburban front clip

05-12-2010, 06:05 PM	#3
knightowl73 TUKE-NoBullChit Customs owner Join Date: Feb 2010 Location: La Marque, Tx Posts: 640	Re: TH-400, No reverse, what to check??? bad thing is 1sr and reverse are the same clutches inside, so most likely if you dont fix it first will be the next gear to go out. has happened to me before but my trans was too far gone and before i could really even try to figure out if it was something simple, 1st went out as well. my dad says its common. when we rebuilt it, clearly the clutches for 1sr gear wear shot. neve had a prob after that. __________________ OWNER @ NBC Customs...No Bull Chit....'92 GMC C2500 ECSB 350/TH400, '57 FORD SKYLINER (My dad's for now, but its really mine-you'll NEVER see a cooler car at 7 years old lol), '42 ford rat rod shop truck (new project), 91 CHRYSLER VOYER MINIVAN (shop van for now) http://www.facebook.com/#!/nbc.customs

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