10 bolt to 9 bolt
#1
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Car: 1991 Vert Z28
Engine: 305... LS1 waiting to drop in
Transmission: 700-R4... soon 4L60E
Axle/Gears: 3.08 posi nine bolt
10 bolt to 9 bolt
I searched and couldnt find info. will a '85 9 bolt-posi-disc bolt in place of a '91 ten bolt-open-drum. im buying this 9 bolt tommorow at a junk yard, it has 3.08:1 gears and i need to know tonite if it will bolt in. also do i need a proportioning valve off the donor car because it has rear disc? how can i tell the gear ratio on my 91 vert 305 auto ten bolt without pulling the rear cover?
Thanks
Thanks
#2
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Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Yes it will bolt right in.
Expect to have no rear brakes, since the 85 9-bolt will have the crappy Saginaw cast-iron calipers. You will need both the combo valve and the MC, as they are different for the crappy calipers.
Easiest way to tell what gear it is without pulling the cover, is to pull the cover. Anything else is just a guess.
Odds are, it's a 2.73.
Expect to have no rear brakes, since the 85 9-bolt will have the crappy Saginaw cast-iron calipers. You will need both the combo valve and the MC, as they are different for the crappy calipers.
Easiest way to tell what gear it is without pulling the cover, is to pull the cover. Anything else is just a guess.
Odds are, it's a 2.73.
#3
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Personally, I'd take the combo valve and master cylinder.
No, real way to know without pulling the cover.
JamesC
Last edited by JamesC; 01-06-2007 at 08:38 PM.
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Car: 1991 Vert Z28
Engine: 305... LS1 waiting to drop in
Transmission: 700-R4... soon 4L60E
Axle/Gears: 3.08 posi nine bolt
okay wil grab the mc and combo valve for now what calipers would you suggest for future upgrade and will the 85 mc and combo valve effect those upgraded calipers?
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https://www.thirdgen.org/forums/faq-...iscs-89-a.html
JamesC
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Car: 1991 Vert Z28
Engine: 305... LS1 waiting to drop in
Transmission: 700-R4... soon 4L60E
Axle/Gears: 3.08 posi nine bolt
I have been all over the junk yards and cant find the front brake line that goes between the mc and combo valve, mine was missing from the car when i pulled the parts. does anyone know where to get a new line?
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