Axle Codes
Thread Starter
Burning Brakes
Joined: Feb 2014
Posts: 1,045
Likes: 226
From: Cape Neddick Maine
2020 C3 of the Year Finalist - Modified
Axle Codes
So I just picked up a rear differential from a 75 Vette with axle code LR, its a 3.36 ratio. My question is why did they use a LR and AX 3.36 ratio from 71 on up to 75-76?
Race Director
Joined: May 2006
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Thread Starter
Burning Brakes
Joined: Feb 2014
Posts: 1,045
Likes: 226
From: Cape Neddick Maine
2020 C3 of the Year Finalist - Modified
MelWff Thanks for the info. I tried searching the old threads for the answers but I guess I didn't have the wording correct for it to find what I needed 
Le Mans Master
Joined: Sep 2002
Posts: 5,236
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From: Myrtle Beach SC
As you note, AX and LR are 3.36:1 ratio axles and LR is listed from 73-77 while AX is listed from 71-75. Axle were called out as base (standard) axle ratios depending on transmission choice while for that power team, optional ratios were rated as economy or high-performance (high altitude). I would suspect of the two ratios, one was considered for a particular transmission choice while the other...optional. I think its in the shop manuals where these are listed.
Le Mans Master
Joined: Nov 2004
Posts: 5,255
Likes: 771
From: Waterford WI
As you note, AX and LR are 3.36:1 ratio axles and LR is listed from 73-77 while AX is listed from 71-75. Axle were called out as base (standard) axle ratios depending on transmission choice while for that power team, optional ratios were rated as economy or high-performance (high altitude). I would suspect of the two ratios, one was considered for a particular transmission choice while the other...optional. I think its in the shop manuals where these are listed.
