Dana 36 gear question
Thread Starter
Racer
Joined: May 2006
Posts: 281
Likes: 0
From: Urbana OH
Dana 36 gear question
I am really considering changing out my gear ratio. Right now I have 3.07 in my Dana 36 and I was wanting to drop down to a 3.54 or 3.76. My question is if I do this how much time will I pick up in the quarter and what will my new top speed be. I'm running an 86E with the 700R4 and was wandering who of you are already running 3.54 or 3.76 and what your thoughts on them are.... Fuel milage changes and top speed changes. I love acceleration but I could care less about going over 130 because I just sold my Ducati that could do well over 180 (been there done that). I just want to be able to come out of corners on a road coarse like a batt out of welllll you get what I'm say.
Thanks for the advise up front...
Semper Fi,
Merritt
Thanks for the advise up front...
Semper Fi,
Merritt
Pro
Joined: Jan 2005
Posts: 520
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From: Richmond Va
Burning Brakes
Joined: Jun 2005
Posts: 861
Likes: 1
From: Hyde Park NY
St. Jude Donor '05
I am not sure about 1/4 mile change. I had Dana 36 with 3.07 and moved to 3.54. I really like the around town jump the lower gear gives. I have read varying reports about improvements in times. But I do like the wheel spin you get....and increased acceleration in 1st to 2nd.
Thread Starter
Racer
Joined: May 2006
Posts: 281
Likes: 0
From: Urbana OH
I am not sure about 1/4 mile change. I had Dana 36 with 3.07 and moved to 3.54. I really like the around town jump the lower gear gives. I have read varying reports about improvements in times. But I do like the wheel spin you get....and increased acceleration in 1st to 2nd.
Semper Fi
Merritt
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Le Mans Master
Joined: Feb 2005
Posts: 6,485
Likes: 566
From: Clearwater Florida
gear ratio
Hey..I have an 87 and changed to the 3.75's , now running a Dana 44 with 3.45's . So far I like the current setup better . Most of my driving is around town on 45-55 mph boulevards. The most appreciated part is the seat of pants acceleration 1-2 , but mostly 2-3 since this 700R4 likes to get out of 1st gear in a hurry. I recently made a long trip with the 3.75's and averaged 16.8 mpg at 80-85mph . Thats with 400+ cubic inches cam headers , etc . etc. , loaded with bodies and luggage. If you are still near stock and like to DRIVE the car I'd reccommend the 3.50ish ratio. The 86 can be speedo corrected with gears in the trans , the drive gear requires removal of the tailhousing and the driven gear slips onto the sending unit in the side of the same housing . With that much of a change in ratio , you'll likely need to change both . These are obsolete at GM but if you can get part #'s you can usually order them....try a performance oriented tranny shop. Have fun!
Racer
Joined: Dec 2006
Posts: 325
Likes: 2
From: Chattanooga TN
i would just stick with the 3.07... i`ve plenty of cars make little, or no real improvements in track times, with lower gearing...
one of my friends went from a 3.07/D36, to a 3.54/D44 swap... he`s tried several times to get me to sell a 3.07/D44 chunk i have to him...
one of my friends went from a 3.07/D36, to a 3.54/D44 swap... he`s tried several times to get me to sell a 3.07/D44 chunk i have to him...
Burning Brakes
Joined: Jun 2005
Posts: 861
Likes: 1
From: Hyde Park NY
St. Jude Donor '05
How is your roll on acceleration changes up top at highway speeds and how much did it change your fuel economy. I'm debating now going all the way to 3.74 but I don't want to drop down to like 15mpg to get them. Thanks alot for the help guys. And what did you do to change the ecu to fix your speed-o correction???
Semper Fi
Merritt
Semper Fi
Merritt
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
In the L98, you need nothing more than 3.07s. Anyone who reports results of a gear change should note their mods or that they have an LT1, because you will not get anything like the results that LT1 guys get with an L98. It hurts us more than helps, if stock.
Thread Starter
Racer
Joined: May 2006
Posts: 281
Likes: 0
From: Urbana OH
Thanks for all the help guys.
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Whoever told you this probably had a LT1. A lightly modded L98 would definitly slow down in the 1/4 after changing to a ratio that steep.
Pro
Joined: May 2002
Posts: 635
Likes: 6
From: New Jersey
I went from 2.59 to 3.07 to 3.73 gears and I've been play with the Hot Cam and the GM847 cam along with S/R and LT1 intake conversion for the last year or so. And the 3.07 is a good all around gear with the HOT CAM.
Randy
Randy