I just bought a 93 Firebird Formula with an automatic. Always at 10 mph regardless of throttle it shifts into second with a jolt. Every other shift is smooth and normal. What could cause it to shift like this?
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I cant remember
is the 93 a 4L60 or 4L60E?
96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there
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No E in 93. Hey that rhymed.Originally posted by N20LT4Bird
I cant remember is the 93 a 4L60 or 4L60E?
2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"Comment
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There is a valve in the valve body that is worn and leaking. The valve body can be removed without pulling the trans, and the valve can be drilled out and replaced with a new larger replacement from Sonnax. Tranny shops do this on a regular basis.... about $200.
Never mind, I see your in the throws of pulling the whole trans anyway.The Old Guy! '94 z-28, m-6, t-tops, go-fast red, 316k. Now with '96 engine w/ Lt-4 hot cam, roller rockers, heavy duty timing chain, and Spec stage 2 clutch.
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I agree with pete, its probably in the valve body....you may have to drop the valve body and go through it.
A quick one to try - The thottle pressure valve may be hanging. Give the detent cable a couple of tugs and move it back and forth.96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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Check the TV cable first. (I think it is called TV) Have someone press the pedal to the floor, and check the position of the throttle body, and cables going to the throttle body. Pretty sure there are 3 cables going to the throttle body for the 93's (4L60), where the 94's and up had 2 cables (4L60-E). I helped a friend do a TransGo kit on his 93, (700R4 kit) and had to adjust that cable, because it was not tight and was not opening the TB blades fully under WOT. He still has to adjust it from time to time, because it slips. Pretty sure throttle position has something to do with the RPM it shifts at. Let me know if I am wrong, but I would check that before you pull the valve body out.1995 Firebird Formula
(A4 3.23)Ram Air w/ K&N, TransGo Shift Kit w/3 washers
,SLP~Shorty headers, LoudMouth, Air Foil, LineLocks. Catco Cat. Hypertech 160. TB Bypass. MSD~8.5mm. Walbro 255lph. FT MAF ends. LT4KM. BMR~Adj LCA's, Rear sway, Panhard rod. HAL QA1 rear shocks. Random Tech adj TQ arm. Nitto NT555R's. Covered in Zaino. 13.466@103.85 N/A. [1.948 60' 
13.410 @ 102.66 11/20/05]Comment
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Thats what I meant by the detent cable....same thing.Originally posted by Formulaboy95
Check the TV cable first. (I think it is called TV) Have someone press the pedal to the floor, and check the position of the throttle body, and cables going to the throttle body. Pretty sure there are 3 cables going to the throttle body for the 93's (4L60), where the 94's and up had 2 cables (4L60-E). I helped a friend do a TransGo kit on his 93, (700R4 kit) and had to adjust that cable, because it was not tight and was not opening the TB blades fully under WOT. He still has to adjust it from time to time, because it slips. Pretty sure throttle position has something to do with the RPM it shifts at. Let me know if I am wrong, but I would check that before you pull the valve body out.
96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there )
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