I thought I saw somewhere that there was a pice for the valve body that stopped the car from downshifting at the half throttle position. On the highway there seems to be so much gear left in overdrive...but I never get to use it cuase it downshifts at half throttle at around 80 mph

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1987 T/A GTA 5.7L, Bored .020 and ported for .202 valves, edelbrock headers, flowmaster exhaust, JET STAGE II chip, Comp CAM, Adjustable fuel pressure, Airfoil, K&N filter, B&M stage 2 shift kit, and a home depot ram air(Hey it looks good and it works)

 

Summitracing.com part #BMM-70237, $34.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

Don't get the one from summit it really does not prevent the downshift intead I would go with GM part #8673948. Actually I am installin it as soon as it arrives special order from GM dealership.

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383 86 Camaro Z28 ---1/4 mile et>13.65@103mph,,
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,4.10 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

 

Not to call you a liar, just wondering, if it doesn't really prevent the downshift then how can B&M sell it, isn't that false advertisement. Again not saying what you said isn't true.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

Let me step in here before things get out of hand. B&M and others sell a new throttle valve plunger that will SOMETIMES make a difference. You see there are a lot of different ones that have a port in SLIGHTLY different positions, meant to tailor it to the throttle position the engine will be in under different conditions. The GM valve mentioned is the police valve that truelly allows WOT 3-4 shifts. I hope this helps.

[This message has been edited by transfixleo (edited September 09, 2001).]

 

The reason I know that the B&M kit does not do the job is cuz I have it currently on my tranny and it still downshifts way to early, that is why I am going with the one from GM.