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#1
08-05-2007, 09:48 PM
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Th400 diagnosis
well my car was running about 1/2 second slower and i narrowed it down to the transmission. Forward clutch pack looked like new. direct clutch showed hot spots on the plates and dark burnt rings on the clutches, intermediate was burnt up pretty good with alot of hot spots. Everything else in the tranny checked out ok.(air check) I run a full manual valve body.(cheetah) This is after about 2-3 years of abuse, what could cause the slipping? would it be ok to just install new clutches and steels?
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72firebird 3800# 496 316cfm eheads, 11.1:1 compression, custom solid roller, victor 4500 intake port matched, 1050 dominator, continental converter flash 4400 stall. 3.73. 2 inch headers with 3.5 with x to mufflers reduced to 3 inch full exhaust. mallory 250 fuel pump, cal tracs with split monos ..Pump gas 91 octane. |
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#2
08-05-2007, 10:31 PM
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Yes, pound in a full set of bushings, new seals, sealing rings, frictions, steels, and gaskets. Check the intermediate sprag and races. Closely inspect the inside of the drums where the sealing rings seal, check endplay, and tighten up with selectives as required. The frictions and steels are supposed to wear out, that's what they are for, to save the hard parts!.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#3
08-05-2007, 10:44 PM
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thanks.
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72firebird 3800# 496 316cfm eheads, 11.1:1 compression, custom solid roller, victor 4500 intake port matched, 1050 dominator, continental converter flash 4400 stall. 3.73. 2 inch headers with 3.5 with x to mufflers reduced to 3 inch full exhaust. mallory 250 fuel pump, cal tracs with split monos ..Pump gas 91 octane. |
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#4
08-06-2007, 01:15 AM
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I use a 4 clutch intermediate pack in my higher HP TH400 setups.
Does the valve body require you to leave a sealing ring off the center support? |
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#5
08-06-2007, 08:23 AM
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If you haven't done so already, replace the snap ring that holds the intermediate sprag in place with a spiral ring from a 4L80E trans. Higher HP motors tend to cause the original snap ring to expand and fly off, Ask me how I know.
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74 GTO Bracket/Street car and another 74 for the wifey to race with! 70 GTO 400, 4 spd, #'s matching and a little to nice for me to own. Friendship is like peeing your pants..everyone can see it but only you can feel the warmth! |
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#6
08-06-2007, 11:09 AM
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Quote:
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 someone who thinks logically is a nice contrast to the real world.http://www.youtube.com/watch?v=3FfKVVZW1-Y |
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#7
08-06-2007, 10:35 PM
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 sealing ring. 
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