• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

Alt. 1st & 2nd gears in a C4?

  • Thread starter Thread starter DK832
  • Start date Start date Apr 11, 2008

DK832

New Member
Apr 11, 2006
291
0
0
Copenhagen, DK
Apr 11, 2008
#1
  • Apr 11, 2008
  • #1
An odd question: I roadrace my Mustang with a JW Performance C4 with manual reverse valvebody and a Pro Ratchet shifter. I use the C4 as a poor mans sequential box, so far without ruining anything, and with the shifter relocated back, left and up it's really sweet and fast. 3rd is perfect for the track sizes here, hitting the rev limiter at around 140mph (3.70 rear) but 1st is too low except for the very tightest of turns.
So I'd like to go a bit against the mainstream and have a taller 1. and 2. gear than people normally want (for holeshot).
Who do I call for different gears? JW is drag race only it seems. The engine is close to 400HP with an added 200 NOS shot for occasional street fun.
 

DK832

New Member
Apr 11, 2006
291
0
0
Copenhagen, DK
Apr 11, 2008
#2
  • Apr 11, 2008
  • #2
Oh, forgot to mention that the current gears are
2.46:1 1st gear
1.46:1 2nd gear
1:1 3rd gear
650-700 Hp Max
 
1

10secgoal

Active Member
Dec 1, 2003
2,801
3
49
San Diego
Apr 11, 2008
#3
  • Apr 11, 2008
  • #3
I've never seen gear that change the gearing in tht direct, only more for a hole shot. You could always look at a 700r4 from a chebbie, or a GV ubit.Either will cost some money. But the chevy has a long first gear. But might be as expensive as the GV by the time you convert and build for 700 hp.
 

DK832

New Member
Apr 11, 2006
291
0
0
Copenhagen, DK
Apr 12, 2008
#4
  • Apr 12, 2008
  • #4
Yeah, same here. Talked to Lentech and it seems they offer a "close ratio" AOD/4R70 that they don't list in the catalog. 2.18 1st , 1.38 2nd , 1:1 3rd and .67 o/d. I'm not too sure about the O/D and my torque though?
 
B

bnickel

Founding Member
Aug 21, 2002
5,640
3
77
lubbock, texas
Apr 12, 2008
#5
  • Apr 12, 2008
  • #5
DK832 said:
Yeah, same here. Talked to Lentech and it seems they offer a "close ratio" AOD/4R70 that they don't list in the catalog. 2.18 1st , 1.38 2nd , 1:1 3rd and .67 o/d. I'm not too sure about the O/D and my torque though?
Click to expand...


you won't be using the OD function on the track anyway
 
C

chromedog

New Member
Jan 13, 2006
554
0
0
worlds center for speed
Apr 12, 2008
#6
  • Apr 12, 2008
  • #6
a properly preped aod will handle all the torque you can throw at it...the key, in your application will be the input shaft. a good aftermarket input, along with a '91 core (best of the aod direct clutch drum) added frictions, and a mechanical diode to replace the sprag, will give you a real neck snapper.
 
You must log in or register to reply here.
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?