Powerglide - 67 327/300 a/c

[Jim Hester]

I have a '67 327/300 A/C car with a Powerglide. I'm curious at what rpm should the transmission shift from low to high under normal acceleration? Currently it shifts at around 3,200 rpm, but that seems/feels a bit high. Any thoughts?

Thanks.

 

[67l36driver]

Difficult to quantify, i.e. how much 'part throttle'?
WOT upshift somewhere around 60-67 mph w/7.75-15 tire and 3.36 axel ratio.

 

[Jim Hester]

Difficult to quantify, i.e. how much 'part throttle'?
WOT upshift somewhere around 60-67 mph w/7.75-15 tire and 3.36 axel ratio.

I'd say 20-25% throttle.
"WOT"???
I do have 7.75x15's and a 3:36. I would think 60-67 mph in low gear would be well in excess of 4,500 rpm - which I can't believe is right or normal.

 

[67l36driver]

Wide Open Throttle.
Shifts up/down are given in line pressure which requires attaching a guage to the trans and driving it.
Information on line pressures are in your '67 chassis service manual. You have one don't you?

 

[Jim Hester]

Wide Open Throttle.
Shifts up/down are given in line pressure which requires attaching a guage to the trans and driving it.
Information on line pressures are in your '67 chassis service manual. You have one don't you?

67l36driver - thanks for the acronym. Yeah, I have the chassis service manual, I was just looking for an easy answer instead of trying to interpret what I'm guessing are alot of variables.

 

[paul67]

That sounds much too high. From memory (car is in winter storage) I would say mine shifts at about 1,500-1,800 under moderate acceleration and 4,800 at WOT. You may have an adjustable vacuum modulator on that car.

 

[67l36driver]

You might check your throttle valve adjustment. It's on page 7-30.
Basicly the throttle valve raises the line pressure required for upshift as the throttle is opened and as a consequence the speed/rpm of engine.

 

[rskn]

Hey Jim randy @ Aurora Gas here, the guys on the B-J auction said it shifted around 50mph, what RPM soes that equate to on your tach. Also, can you help with :
Where on a powerglide are the casting numbers. I understand 65-67 Vettes all used the same unit. My tank sticker says my 4 speed 67 came with an automatic so I bought a powerglide on a skid with all the related parts in '96. How can I tell the casting date of the auto and is it true that the P/G should be dated 2-6 months before the car's build date. I have Nolan Adams' text on 63-67s but its not quite specific enough, any help?