3.73 or 4.10 on my 67 f-250

Joshj963 · Post by **Joshj963** » Thu Aug 18, 2005 10:12 pm

hi guys i'm new here and know nothing about working on my truck.

i have a 1967 F-250, 352 big block with 4.10 gears. my problem is @ 65 mph i'm cranking 3100 rpm and @70 mph 3500 rpm. I'm thinking about changing to Dana 3.73, does anyone have this setup or any advice?

P.S. i work out of my truck but i don't tow or carry any any thing in exsess of 500-600 lbs. Mostly around town but i do take it down the highway 2-5 times a month.

Thanks for any help guys.

heep70 · Post by **heep70** » Thu Aug 18, 2005 10:33 pm

and

to the site.

I also run 4:10R&P. I know what you mean by the high RPM. I sometimes wish I would had goto 3:73s. You could probably go on down to 3:54s. Get some more opinions from the folks that are running these gears.

Post some pic if you get a chance, we like them pics. Also stop by the welcome mat.

68F250 · Post by **68F250** » Thu Aug 18, 2005 10:34 pm

Hi Josh and

to the site!

Hey we were just talking about that a little while ago.
http://fordification.com/forum/viewtopic.php?t=4737

I have a mechanic friend that does axle work so I can't help you with the Dana, sorry

Anyway, welcome again!

Joshj963 · Post by **Joshj963** » Thu Aug 18, 2005 10:50 pm

thanks for the welcome!!

i did read that thread but i didn't know if my 352 was different than his 360.

Heep60 sweet lookin truck, mines a 67 f-250 2wd so i'm thinkin street truck. but not till my wifes car gets replaced and i'm no longer working out of it.

Faithful Old Road Dog · Thu Aug 18, 2005 10:54 pm

What size tires are you running now? Try a taller tire size like 33's. That will drop your rpm's just a hair.

heep70 · Post by **heep70** » Thu Aug 18, 2005 11:09 pm

What tranny you got? Manual?

F.O.R.D., I am running 33"s, it don't help.

Joshj963 · Post by **Joshj963** » Thu Aug 18, 2005 11:11 pm

i just now ran out and put a tape on em and there 31's.

Joshj963 · Post by **Joshj963** » Thu Aug 18, 2005 11:14 pm

my tranny is a manual 4-Speed new process

68F250 · Post by **68F250** » Fri Aug 19, 2005 12:02 pm

Joshj963 wrote:i did read that thread but i didn't know if my 352 was different than his 360.

Yes, they're almost the same engine, a 360 is a bored out 352 with lower compression. Actually I think the 352 was a better engine.

heep70 · Post by **heep70** » Fri Aug 19, 2005 8:12 pm

The 3:54 would be good with the manual. 3:73 with a C6.

Joshj963 · Post by **Joshj963** » Fri Aug 19, 2005 9:16 pm

heep70

so do you think 3.53 or 3.73

i don't want it to be a dog, most of my driving is around town, i would just like to put a cruise kit on and go around 70-75 without cranking 3500-3800 rpm.

19674x4 · Post by **19674x4** » Fri Aug 19, 2005 10:09 pm

3.52 3.73 would give you better gas mileage to,

heep70 · Post by **heep70** » Fri Aug 19, 2005 10:15 pm

Fordification and 68F250 have a formula to figure out what RPM you will be doing using the tire size, R&P and speed. You will be able to see what RPM you will be doing with the combo you want. PM one of those two for that. I know it is here on the forum somewhere also.

Joshj963 · Post by **Joshj963** » Fri Aug 19, 2005 10:59 pm

thanks for all the tips guys

heep70 · Post by **heep70** » Fri Aug 19, 2005 11:10 pm

Here it is.

http://fordification.com/forum/viewtopi ... hlight=mph

The FORDification.com Forums

3.73 or 4.10 on my 67 f-250

3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

Re: re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250

re: 3.73 or 4.10 on my 67 f-250