Tko-600 pops out of 4th - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Alaskan71 · 04-03-2011, 08:33 PM

Hey guys I just installed a brand new tko-600 transmission and new clutch kit from American powertrain into my 71 c10. It has maybe 50 miles on it but it keeps popping out of fourth gear. A couple times when the back pressure built up a little bit while going downhill and then also a couple times when the rpm's dropped too low. There also doesn't seem to be any resistance on the shifter to keep it in the 4th position as opposed to sliding up into neutral.... Does anyone have any ideas why this is happening or how to fix it? I would appreciate the help.

Thanks for any information
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oldblue1968chevy · 04-03-2011, 11:06 PM

Id be giving american powertrain a call lol

swb85 · 04-04-2011, 10:27 AM

For sure call them, there's a problem with the fork/synchro/blocker on 4th gear if it won't stay put.

04-03-2011, 08:33 PM	#1
Alaskan71 Registered User Join Date: Apr 2010 Location: Anchorage, AK Posts: 18	Tko-600 pops out of 4th Hey guys I just installed a brand new tko-600 transmission and new clutch kit from American powertrain into my 71 c10. It has maybe 50 miles on it but it keeps popping out of fourth gear. A couple times when the back pressure built up a little bit while going downhill and then also a couple times when the rpm's dropped too low. There also doesn't seem to be any resistance on the shifter to keep it in the 4th position as opposed to sliding up into neutral.... Does anyone have any ideas why this is happening or how to fix it? I would appreciate the help. Thanks for any information Posted via Mobile Device

04-03-2011, 11:06 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Tko-600 pops out of 4th Id be giving american powertrain a call lol __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

04-04-2011, 10:27 AM	#3
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Tko-600 pops out of 4th For sure call them, there's a problem with the fork/synchro/blocker on 4th gear if it won't stay put. __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD



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