Power glide-no reverse

NHRA1926 · 10-29-2020, 03:27 PM

Just installed a Power Glide in my Camaro that came from a known running Super Stock car. Changed the 2.08 1st gear set to a 1.76 1st gear set before we installed the trans in the car. Installed 6 quarts of trans fluid, it shows full on the stick while running in park, and now there is no reverse. It does have a pro brake valve body. I also tried activating the trans brake button in reverse, but still had no reverse. Tried activating the trans brake in neutral, still nothing. 1st and 2nd gear seem to be working properly. Also, trans brake will not work while in 1st gear. Put it in 1st gear, step on the foot brake to stop the tires from rotating, activate button, let off foot brake and the tires roll forward while pressing the trans brake button. Also tried it while in 2nd gear just to eliminate if it was a reverse pattern valve body, still would not hold when let off on the foot brake. Verified that the trans brake solenoid is in fact working. Remove solenoid, verified that the valve/plunger is moving freely in the housing. Some one said that the input shaft for a 2.08 gear set should not be used with a 1.76 gear set. Is this true? Would this in fact effect reverse not working? I'm stumped on this one. Any suggestions?

HawkBrosMav · 10-29-2020, 04:02 PM

I've seen where the plunger is there but the solenoid doesn't push it into the valve body far enough. The valvebodies in those thing can shift a bit and be tightened down in various positions which allows this a bit... I also believe that band adjustment comes into play on the TB holding. Have you verified that the band is correctly adjusted. I can't speak about the input issue as I've never run into a 2.08 first gear.

NHRA1926 · 10-29-2020, 04:12 PM

Band adjustment went as follows. Loosened lock nut, turned allen screw clockwise until snug, then turned allen screw counter clockwise 3.5 turns, then tightened lock nut while holding allen screw in place.

63corvette · 10-29-2020, 05:14 PM

Not all solenoids are the same length.
You have to pull the pan to see if the solenoid is pushing the plunger far enough into the valve body.
Not sure about input shaft and gear set however, that would causing a grinding noise I would think.
Good Luck as I know that can be frustrating.
Rick Cates
Canyon, TX

Mike Pearson · 10-29-2020, 08:35 PM

The input shafts are different on the two low gear planetary sets. Typically the 1.76 is the large heavy unit. The 2.08 for a super. Stock application would have been built in the smaller 1.82 carrier. The reverse ring gear is also different between the two.

ss3011 · 10-29-2020, 10:13 PM

Transmission Specialties makes a "Uni-Shaft" which fits both 1.76 and 1.82 ratio's .

10-29-2020, 03:27 PM	#1
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 234 Likes: 12 Liked 212 Times in 64 Posts	Power glide-no reverse Just installed a Power Glide in my Camaro that came from a known running Super Stock car. Changed the 2.08 1st gear set to a 1.76 1st gear set before we installed the trans in the car. Installed 6 quarts of trans fluid, it shows full on the stick while running in park, and now there is no reverse. It does have a pro brake valve body. I also tried activating the trans brake button in reverse, but still had no reverse. Tried activating the trans brake in neutral, still nothing. 1st and 2nd gear seem to be working properly. Also, trans brake will not work while in 1st gear. Put it in 1st gear, step on the foot brake to stop the tires from rotating, activate button, let off foot brake and the tires roll forward while pressing the trans brake button. Also tried it while in 2nd gear just to eliminate if it was a reverse pattern valve body, still would not hold when let off on the foot brake. Verified that the trans brake solenoid is in fact working. Remove solenoid, verified that the valve/plunger is moving freely in the housing. Some one said that the input shaft for a 2.08 gear set should not be used with a 1.76 gear set. Is this true? Would this in fact effect reverse not working? I'm stumped on this one. Any suggestions?

10-29-2020, 04:02 PM	#2
HawkBrosMav Member Join Date: Apr 2009 Posts: 362 Likes: 6 Liked 302 Times in 73 Posts	Re: Power glide-no reverse I've seen where the plunger is there but the solenoid doesn't push it into the valve body far enough. The valvebodies in those thing can shift a bit and be tightened down in various positions which allows this a bit... I also believe that band adjustment comes into play on the TB holding. Have you verified that the band is correctly adjusted. I can't speak about the input issue as I've never run into a 2.08 first gear.

10-29-2020, 04:12 PM	#3
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 234 Likes: 12 Liked 212 Times in 64 Posts	Re: Power glide-no reverse Band adjustment went as follows. Loosened lock nut, turned allen screw clockwise until snug, then turned allen screw counter clockwise 3.5 turns, then tightened lock nut while holding allen screw in place.

10-29-2020, 05:14 PM	#4
63corvette Senior Member Join Date: Mar 2007 Location: Canyon, Tx Posts: 551 Likes: 127 Liked 353 Times in 102 Posts	Re: Power glide-no reverse Not all solenoids are the same length. You have to pull the pan to see if the solenoid is pushing the plunger far enough into the valve body. Not sure about input shaft and gear set however, that would causing a grinding noise I would think. Good Luck as I know that can be frustrating. Rick Cates Canyon, TX

10-29-2020, 08:35 PM	#5
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,442 Likes: 613 Liked 1,915 Times in 574 Posts	Re: Power glide-no reverse The input shafts are different on the two low gear planetary sets. Typically the 1.76 is the large heavy unit. The 2.08 for a super. Stock application would have been built in the smaller 1.82 carrier. The reverse ring gear is also different between the two. __________________ Mike Pearson 2485 SS

10-29-2020, 10:13 PM	#6
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: Power glide-no reverse Transmission Specialties makes a "Uni-Shaft" which fits both 1.76 and 1.82 ratio's .