quick question about gear swap
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Racer
Joined: Nov 2005
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From: San Diego California
quick question about gear swap
ok, i have 2.73's stock in my 1997 c5 automatic. I want to do a gear swap. i looked around and found c5 zo6 differentials off gmpartsdirect.com for a good price. but how in the heck do i get 3.73 rear differentials. the only one i found was slp's and it was $2,000. cant i just get my stock rear differential ring and pinion swapped out for 3.73's , or do i have to buy a complete new one from slp for $2000 ?
\\help!!!!
\\help!!!!
Safety Car
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From: Fishing Somewhere Cold
St. Jude Donor '11-'12-'13, '15
I believe that 3.42's or 3.73's R & P will not fit the 2.73 carrier without machine work which probably ends up weakening the carrier structure. After 3.42's the price goes up pretty quickly for 3.73's or 4.10's.
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From: Savannah Georgia
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From: Fort Wayne Indiana
There is no machining processes required for a 2-series differential conversion and when built properly, there is NO strength difference between the 2 or 3-series differentials. We've been building these with outstanding success in durability/performance for over 3 years now... 
DTE
DTE
Melting Slicks
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From: Insane Diego Kalifonya Baby
Originally Posted by DynoTech Engineering
There is no machining processes required for a 2-series differential conversion and when built properly, there is NO strength difference between the 2 or 3-series differentials. We've been building these with outstanding success in durability/performance for over 3 years now...
DTE
DTE
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From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
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Originally Posted by gottiman
ok, i have 2.73's stock in my 1997 c5 automatic. I want to do a gear swap. i looked around and found c5 zo6 differentials off gmpartsdirect.com for a good price. but how in the heck do i get 3.73 rear differentials. the only one i found was slp's and it was $2,000. cant i just get my stock rear differential ring and pinion swapped out for 3.73's , or do i have to buy a complete new one from slp for $2000 ?
\\help!!!!
\\help!!!!
If you are considering this conversion - there are other factors to consider, you will have to either buy a Predator or a LS1 Edit (there are others, too) or go somewhere where someone with experience can modify the programming on the PCM for you. You will need to have things like shift points and shift pressures changed to take full advantage of the higher (numerical) gearing.
I have friends that have made this swap...one went from a 2.73 to a 3.42. Another went from a 3.15 to a 3.73. Both are very happy with the outcome. You might consider going over to the Scan and Tune Forum here on CF and post any questions over there. There are a couple of guys - notably Mike Mercury that are extremely knowlegable on this topic and very willing to answer some questions.
Good luck!
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From: The Beautiful Greater Bay Area California
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From: Fort Wayne Indiana
Originally Posted by VLVETTE
Are you saying you can do a gear swap to 3.42s or better in the 2.73 housing? I was told different. If thats the case I have a 2.73 laying around that isn't as worthless as I thought.
DTE
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
I went from 2.73:1 to ECS/DTE hardened 3.90:1 (A4) and I couldn't be happier. I just crossed the 500 mile break in milestone and just started getting on it a little. Boy!! Talk about major PermaGrin(tm) 
And DTE are way
I got their trans brace as well 
And DTE are way
I got their trans brace as well
Safety Car
Joined: Jan 2005
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From: Hayward (Bay Area) CA
Originally Posted by DynoTech Engineering
There is no machining processes required for a 2-series differential conversion and when built properly, there is NO strength difference between the 2 or 3-series differentials. We've been building these with outstanding success in durability/performance for over 3 years now...
DTE
DTE
If you can just change the gears and use the same case (rebuild my 2.73), how much for that? I'm hoping a complete rebuild, including gaskets, and seals..etc. Plz Educate me about the gears and TC......
Thanks in advance...
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From: Fort Wayne Indiana
Adding a HP torque converter will always make the car accelerate much faster and harder than without, so the choice is ultimately yours on what your budget is for the driveline upgrade and how quick you want your car to be.
Also, here is a menu of our current 2005 differential options and prices.
http://www.dynotech-eng.com/dte_c5_diff.htm
Best Regards,
DTE
Also, here is a menu of our current 2005 differential options and prices.
http://www.dynotech-eng.com/dte_c5_diff.htm
Best Regards,
DTE
