#1  
Old 03-31-2021, 04:36 PM
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gs462 gs462 is offline
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Default Help Rearend ID

I have tried everything I can think of to ID this rear, including google and every other search engine. The numbers on the Axle tube are CRX 0421g1. The numbers on the housing are
GM 70 pass side and 3969340nf drivers side.
Any help would be appreciated.

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Shawn
1971 Formula #s match white/tan
1973 TA Brewster/white #s match
1972 Buick GS455 #s match 69k miles now a 470 stroker.
1986 Buick Ttype 66K miles many mods 10 sec street car.
2001 Mustang gt premium vert. Mamas car
  #2  
Old 03-31-2021, 04:53 PM
eaglesan13 eaglesan13 is offline
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Try looking here:

http://www.wallaceracing.com/axlesearch.htm

Quote:
Originally Posted by gs462 View Post
I have tried everything I can think of to ID this rear, including google and every other search engine. The numbers on the Axle tube are CRX 0421g1. The numbers on the housing are
GM 70 pass side and 3969340nf drivers side.
Any help would be appreciated.

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1971 Formula, 455HO/RA, M22 four speed, 3.73 posi, Lucern Blue/Black deluxe
  #3  
Old 03-31-2021, 05:13 PM
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gs462 gs462 is offline
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Quote:
Originally Posted by eaglesan13 View Post
I did, Thanks I tried every search there is. with no results

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Shawn
1971 Formula #s match white/tan
1973 TA Brewster/white #s match
1972 Buick GS455 #s match 69k miles now a 470 stroker.
1986 Buick Ttype 66K miles many mods 10 sec street car.
2001 Mustang gt premium vert. Mamas car
  #4  
Old 03-31-2021, 06:00 PM
eaglesan13 eaglesan13 is offline
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I cut and pasted the info below. If you follow the link I first posted, it will show you how to read the date code, etc (0421G1).

1 Matches Found (displaying 1 to 1)

Year 1970
Body Style Firebird
Gear Ratio 2.73
Gear Count 41/15
Std Code CRX
Locking Code CRY




Quote:
Originally Posted by gs462 View Post
I did, Thanks I tried every search there is. with no results

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1971 Formula, 455HO/RA, M22 four speed, 3.73 posi, Lucern Blue/Black deluxe
  #5  
Old 04-01-2021, 09:41 AM
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gs462 gs462 is offline
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Thanks, I tried pasting it in and go nothing maybe i did it wrong.

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Shawn
1971 Formula #s match white/tan
1973 TA Brewster/white #s match
1972 Buick GS455 #s match 69k miles now a 470 stroker.
1986 Buick Ttype 66K miles many mods 10 sec street car.
2001 Mustang gt premium vert. Mamas car
  #6  
Old 04-01-2021, 11:54 PM
eaglesan13 eaglesan13 is offline
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From the Wallace Racing website...
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1971 Formula, 455HO/RA, M22 four speed, 3.73 posi, Lucern Blue/Black deluxe
  #7  
Old 04-02-2021, 05:59 AM
Aus78Formula Aus78Formula is offline
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The ratio only tells you how it came 50 years ago, open it up to confirm.

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Old 04-02-2021, 07:54 AM
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Ahhh I was putting the whole code in Thanks.

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Shawn
1971 Formula #s match white/tan
1973 TA Brewster/white #s match
1972 Buick GS455 #s match 69k miles now a 470 stroker.
1986 Buick Ttype 66K miles many mods 10 sec street car.
2001 Mustang gt premium vert. Mamas car
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