no-hop bars wont fit wrong diff need to decode?? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

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post #1 of 5 (permalink) Old Jan 13th, 01, 10:07 AM Thread Starter
Join Date: Dec 2000
Location: glendale,az,meracopa
Posts: 7
I just got my diff. back from being rebuilt, went from open diff. to a locker and from 3.31 ring to 3.90. My new problem is I was trying to put my new no-hop bars on and all I can say is there is not a chance in hell they are going to work. I know they are the right one but now think maybe I do not have the right diff. I pulled some numbers of of it in case someone can decode it for me nobody in Arizona is helping. On the axle tube I found the number CY10006B and on the pumpkin webbing I found GM4 F 21 70

and also NF
X 3917124
I would really be grateful for any help.

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post #2 of 5 (permalink) Old Jan 17th, 01, 7:30 AM
Super Mod
Join Date: Aug 1998
Location: Chalfont, PA
Posts: 1,769
The No-Hop bars are fairly universal, and fit just about any coil spring rear, whether it's a 10 bolt or 12 bolt from a Vega, Chevelle, Impala, or whatever.

Why do you say they don't fit?
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post #3 of 5 (permalink) Old Jan 17th, 01, 10:09 AM
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Join Date: Aug 1998
Location: Dallas, Tx, USA
Posts: 1,746
CY10006B- Probably is CY1006B
CY = 67 or 68- 3.07, non-posi
1006 = Oct., 6th build date
B = Buffalo assy plant

Steve Strasemeier (70SS 396, Fathom Blue/White Stripes)

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post #4 of 5 (permalink) Old Jan 17th, 01, 7:14 PM
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Join Date: Nov 2000
Location: evansville wisconsin
Posts: 874
CY= should be a '68 3:07 rearend.
Keep trying with the no hop bars they will fit. Follow manufactures directions.
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post #5 of 5 (permalink) Old Jan 18th, 01, 10:00 PM
Join Date: Oct 1998
Posts: 3,752
You will probably need to do some grinding on them. Perhaps on the rear end case, also.

Pat Kelley
66 El Camino, daily driver
67 El Camino, STRIP/street
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