Rear end gear selection

Vinyl66 · September 14th, 2007, 06:04 PM

about the car. 1966 w/ 68 302 moddified and a auto C4 tranny. my 66 has stock 2.80 8inch rear end and i am looking for performance only out of this car. 1/4 mile times is what im looking for. im tring to decide if i should go w/ the 3.80 or 4.11 locking rear end. i am leaning to the 4.11 however i don't want my top speed to be 80mph haha. also is it do-able to go from stock non-locking 2.80 to locking by just changing the center?

Drick · September 15th, 2007, 02:15 AM

Go with the 4.11 but change that tranny out for a c6 or something with a little more gear. you can go to locking with just changing the center section as long as you get the center section with the same number of splines as the axles

Vinyl66 · September 15th, 2007, 02:56 AM

thanks i think i am going to go 4.11. but i think my c4 is the same as the c6 except the c4 is light/med duty and the c6 is heavy duty for trucks. my 302 is not putting out a ton of power but it should be above 300+hp, so i think i can still get away with the c4. i could be wrong tho.

Drick · September 15th, 2007, 03:16 AM

You should be able to get buy with the c4 but unless im wrong could you get a 3 speed auto in the later early years that I thought was a c6 mabey im wrong

Vinyl66 · September 18th, 2007, 11:06 PM

the 4.11's will give me a power conversion ratio of 10.11 and the 3.80's will be 9.3. currently i got a ratio of 6.88

ive also read that having a ratio above 9 is good so is 10 even better? or too much

Drick · September 19th, 2007, 12:56 AM

It will be fine but you will lose top speed with 4.10s

Juggalo_X · September 19th, 2007, 11:25 AM

Originally Posted by 8t6gt

It will be fine but you will lose top speed with 4.10s

if your getting up there then u dont need to be driving... i have 4.10 have hit 120 mph and still had more room to go just, plainly that shit is fast and i dont need to do that lol so i SLOWWWW DOWN.

Vinyl66 · September 19th, 2007, 12:37 PM

thanks ill be going with the 411's i just wasn't sure how much top speed i would be losing paired with my C4

Juggalo_X · September 19th, 2007, 12:47 PM

check this out http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

Vinyl66 · September 19th, 2007, 12:51 PM

thats pretty cool just doesn't carry the old school trans

September 14th, 2007, 06:04 PM	#1
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	Rear end gear selection about the car. 1966 w/ 68 302 moddified and a auto C4 tranny. my 66 has stock 2.80 8inch rear end and i am looking for performance only out of this car. 1/4 mile times is what im looking for. im tring to decide if i should go w/ the 3.80 or 4.11 locking rear end. i am leaning to the 4.11 however i don't want my top speed to be 80mph haha. also is it do-able to go from stock non-locking 2.80 to locking by just changing the center?

September 15th, 2007, 02:15 AM	#2
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	Go with the 4.11 but change that tranny out for a c6 or something with a little more gear. you can go to locking with just changing the center section as long as you get the center section with the same number of splines as the axles __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

September 15th, 2007, 02:56 AM	#3
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	thanks i think i am going to go 4.11. but i think my c4 is the same as the c6 except the c4 is light/med duty and the c6 is heavy duty for trucks. my 302 is not putting out a ton of power but it should be above 300+hp, so i think i can still get away with the c4. i could be wrong tho. __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!!

September 15th, 2007, 03:16 AM	#4
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	You should be able to get buy with the c4 but unless im wrong could you get a 3 speed auto in the later early years that I thought was a c6 mabey im wrong __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

September 18th, 2007, 11:06 PM	#5
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	the 4.11's will give me a power conversion ratio of 10.11 and the 3.80's will be 9.3. currently i got a ratio of 6.88 ive also read that having a ratio above 9 is good so is 10 even better? or too much __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!!

September 19th, 2007, 12:56 AM	#6
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	It will be fine but you will lose top speed with 4.10s __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

September 19th, 2007, 12:37 PM	#8
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	thanks ill be going with the 411's i just wasn't sure how much top speed i would be losing paired with my C4 __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!!

September 19th, 2007, 12:47 PM	#9
Juggalo_X I Post Entirely Way Too Much 2001 Mustang 232/CBR600 14+@Slow Join Date: Jan 2007 Location: South Western Ontario Posts: 6,688 iTrader: 0 reviews	check this out http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

September 19th, 2007, 12:51 PM	#10
Vinyl66 Anatidaephobic 1966 Vinyl Mustang 2012 Hyundai Elantra GLS Join Date: Sep 2007 Posts: 2,353 iTrader: 0 reviews	thats pretty cool just doesn't carry the old school trans __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!!

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