Is there a difference between the 4L60e in the z28s and the trans ams/formulas? Or is the only difference in ECu between them? I know the 4L60e can be started in 1st in a trans am but in my z28 it was only able to be started in 2nd. is that just a programming thing?
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darkz711Tags: None
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The transmissions are the same.
The reason you couldnt manually select 1st was because GM had to do that to meet rolling noise standards with that particular gear ratio in the rear end.
GM blocked it out by restricting the actual shifter from going back another notch. It is a common and simple mod on those cars to cut out the tab blocking the shifter so it can go back into 1st.Tracy
2002 C5 M6 Convertible
1994 Z28 M6 Convertible
Current Mods:
SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids
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Maybe I don't understand, but all cars start in 1st gear. When you select 2nd, it just locks out higher gears.
As far as I know, the transmission is identical within the same model year. There were some differences in ECU's in that certain T/A's had a performance shift button that would firm up the shifts. Is your Trans Am a 93?
There were different gear ratios in the '93 F-bodies. The 93's also had a 4L60 vice the 4L60E. The main difference being the variability of the shift firmness in the E version. Now the reason you can't select 1st gear is due to noise restrictions. At certain speeds in 1st gear the car exceeded EPA restrictions.
You can modify it to select 1st gear very easily. Take off the plate over the shifter and try to downshift it to 1st. You'll notice that the stick will come into contact with a plastic nub. You shave that off and you can select 1st.Joe K.
'11 BMW 328i
'10 Matrix S AWD
Previously: '89 Plymouth Sundance Turbo, '98 Camaro V6, '96 Camaro Z28, '99 Camaro Z28, '04 Grand Prix GTP
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darkz711
thanks guys, ya I was just looking at the auto sitting in the garage and someone told me that there was a difference between them and I didn't think there was so you guys just confirmed what i thought. The auto isn't in my car anymore, so i wont be doing any first gear mods
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As Trace said, the trannys are the same. Not having the 1st gear selector only means you can't hold it MANUALLY in first gear. The shifters are even the same. The only difference is the block that Trace meantioned. It'll take you about 10 minutes to removed the shifter selector plate and knock out the block. I used a chisel and hammer. Voila.LS15 Power! Another LSx engine coming soon.
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i may not understand what you guys are talking about i run a f-body club in maine and we have about 10 cars , diff. years, and models and i have never seen one where you cant select 1st gearin my 94 Z you canselect from all 4 gears. what years and models can you NOT
1994 Z28 stage 2 intercooled procharger, P-1sc, 6lb pully,42lbfuel injectors,255intank pump,1 3/4headers,highflow cat, borla ajust. cat back,chrome moly LCA,chrome moly ajust. panhard bar, Kenny Brownweld-in subframe conectors, built trans. kevlar lined 2600 stall, kevlar clutches, hardend parts,,built rearend; moser axles, eaton posi, richmond 3.42 gears, rare ROH ZR6 17* 9.5 wheels, custom computer tune with laptop and LT1edit , 380rwhp 395rwtq , 60' 1.71, 1/8th 8.00,1/412.60@109mph
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1994 Z28 stage 2 intercooled procharger, P-1sc, 6lb pully,42lbfuel injectors,255intank pump,1 3/4headers,highflow cat, borla ajust. cat back,chrome moly LCA,chrome moly ajust. panhard bar, Kenny Brownweld-in subframe conectors, built trans. kevlar lined 2600 stall, kevlar clutches, hardend parts,,built rearend; moser axles, eaton posi, richmond 3.42 gears, rare ROH ZR6 17* 9.5 wheels, custom computer tune with laptop and LT1edit , 380rwhp 395rwtq , 60' 1.71, 1/8th 8.00,1/412.60@109mph
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Originally posted by roastmi may not understand what you guys are talking about i run a f-body club in maine and we have about 10 cars , diff. years, and models and i have never seen one where you cant select 1st gearin my 94 Z you canselect from all 4 gears. what years and models can you NOT
http://web.camaross.com/forums/showt...ear+select+modTracy
2002 C5 M6 Convertible
1994 Z28 M6 Convertible
Current Mods:
SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids
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Originally posted by Joe K. 96 Zeee!!There were some differences in ECU's in that certain T/A's had a performance shift button that would firm up the shifts.'95 Trans Am - A4, LE2 heads, LE1 cam, 1.6 ProMags, Comp R's, AS&M CAI, AS&M 54mm, MAC midlengths, Random Tech. cat, Borla cat back, PCMforless, Vigilante 2800, 3.73's, BMR LCAs/panhard/shock tower brace
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I always thought that it might be similar to the B&M electronic electronic shift improver. It used a resistor chip to change line pressure. If I recall, the B&M thing didn't improve acceleration, it just had the car shift firmer. Maybe the Firebird button does more than that....I'm not really sure.
Here's some more info from the F-body FAQ:
Q: What's the difference between the 4L60 and 4L60E transmission?
A: The 1993 cars came with the 4L60 automatic transmission while the 1994's and later got the electronic version (4L60'E'). The 4L60E got an electronic valve body which can vary the shifts and feel dynamically to meet the existing driving conditions. Actually, if you drive a '93 and '94 (under normal conditions), there is a noticeable difference in that the 93 shifts are much more firm and abrupt. The 94 (and later) have a "variable" feel depending on throttle position, which of course at wide open throttle, feels like the 93. This electronic valving is also supposed to reduce the wear over the life of the transmission. If you have a 93, you might want to try driving in 3rd (or "D" on the Pontiacs). Once the revs get to high in 3rd, put it into 4th (or "OD") manually. Due to the valving, the shifts should be much firmer at all times in 3rd than 4th.Joe K.
'11 BMW 328i
'10 Matrix S AWD
Previously: '89 Plymouth Sundance Turbo, '98 Camaro V6, '96 Camaro Z28, '99 Camaro Z28, '04 Grand Prix GTP
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Originally posted by Kevin - Blown 95 TAIt changes the firmness too. There's a separate table for the performance shift pressure offsets.'95 Trans Am - A4, LE2 heads, LE1 cam, 1.6 ProMags, Comp R's, AS&M CAI, AS&M 54mm, MAC midlengths, Random Tech. cat, Borla cat back, PCMforless, Vigilante 2800, 3.73's, BMR LCAs/panhard/shock tower brace
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Sin_Cere
More Information: Scholars Only
Originally posted by Kevin - Blown 95 TAIt changes the firmness too. There's a separate table for the performance shift pressure offsets.
I would really like to know what the specifics are on this option... any scholars?
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