Gear Ratio
#1
NewHi. I'm building a 400hp 351c for my 72 mach 1. what would be a good rear end ratio to use for power? i have the FMX transmission. Thanks
Reply
#2
How do you plan to drive the car? In town only, on the highway some? With an auto trans and no overdrive, 3.50:1 is a popular ratio when you still want to do occasional highway driving. My older brother ran that ratio in a 69 Mach 1 with a 351W and FMX trans way back in high school. It seemed to be about lowest reasonable ratio to also do some highway driving.

Best Regards,
Mike
Reply
#3
I have to agree with Mike...it all depends on how you plan on driving the car. If you are planning on putting highway mileage on your car then 3:50 or better yet 3:25 are better choices. If you are looking for more performance, a bigger smile, and less than good gas mileage, you can run 3:89's or 3.91. I opted for 3:89's in my car and have not been happier with the choice. It really depends on what your expectations of what you want out of the car.
Reply
#4
+1 on those figures. I've heard of people running higher and lower, but then they run into problems.
Reply
#5
For everyday driving and highway use I'd go with a 3.25:1 gear ratio.
Reply
#6
I run 3.89:1 in my 69 Mach 1. But it's a manual trans and I only drive it in town. It's fun in town, but I wouldn't do highway driving with them.

I could see where a 3.25:1 is suitable for regular highway driving. Not as fun in town though.

Best Regards,
Mike
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)
[-]
Latest Threads
What's One More Iron In The Fire!
Last Post: fram lee666
03-18-2024 06:21 PM
» Replies: 125
» Views: 238059
"Jacobra"
Last Post: JTS71 Mach1
06-30-2023 11:13 PM
» Replies: 86
» Views: 150863
My old Queensland Ambulance
Last Post: JTS71 Mach1
06-30-2023 11:08 PM
» Replies: 5
» Views: 1688
New member from San Jose, CA
Last Post: JTS71 Mach1
05-09-2023 08:39 AM
» Replies: 12
» Views: 3957
Saving Seatbelts
Last Post: Jim
02-19-2023 10:23 PM
» Replies: 2
» Views: 9109
Sourcing new wheels
Last Post: JTS71 Mach1
01-25-2023 02:34 PM
» Replies: 1
» Views: 1995
Shaker Air Filter
Last Post: JTS71 Mach1
01-08-2023 02:24 AM
» Replies: 3
» Views: 1466
1971 Mach 1 parting out interior parts -...
Last Post: ylwhrse
12-22-2022 01:38 PM
» Replies: 0
» Views: 640
Painting
Last Post: Rare Pony
12-14-2022 06:24 PM
» Replies: 2
» Views: 1964
WELCOME ALL NEW MEMBERS INTRODUCE YOURSE...
Last Post: JTS71 Mach1
08-31-2022 01:36 PM
» Replies: 82
» Views: 157029
1970 mach 1 matching numbers
Last Post: Kstweeter
08-31-2022 10:31 AM
» Replies: 1
» Views: 1086
Brake booster/servo hose length
Last Post: JTS71 Mach1
08-23-2022 09:40 AM
» Replies: 7
» Views: 2996
New Member
Last Post: JTS71 Mach1
08-20-2022 11:18 AM
» Replies: 2
» Views: 1498
smooth window operation on 70 Mach
Last Post: CUSTOMMISER
08-15-2022 12:10 PM
» Replies: 2
» Views: 1474
Blinkers on solid
Last Post: busted21
08-09-2022 03:58 AM
» Replies: 14
» Views: 8718
Blinkers on solid when lights on.
Last Post: JTS71 Mach1
08-08-2022 12:06 PM
» Replies: 1
» Views: 1719
351 cj running hot
Last Post: busted21
08-08-2022 12:13 AM
» Replies: 5
» Views: 3403
Major Winter projects
Last Post: JTS71 Mach1
07-09-2022 05:12 AM
» Replies: 49
» Views: 21264
Happy Fathers Day!!!
Last Post: JTS71 Mach1
06-20-2022 02:34 AM
» Replies: 0
» Views: 1685
1969 Raven Black 390 Looking For
Last Post: mason1958
06-11-2022 09:48 AM
» Replies: 10
» Views: 15080

>