The Ford Barn

johnneilson · 02-22-2022, 01:13 PM

I have been looking for information on when the 3.25 and 3.27 gears were available. These would be for V8 "straddle mount" rearends.

And what cars they were offered in.

Thanks, John

19Fordy · 02-22-2022, 01:45 PM

What does "straddle mount" mean?

Pete · 02-22-2022, 02:07 PM

Quote:

Originally Posted by 19Fordy

What does "straddle mount" mean?

It has a rear pinion support bearing.

deuce lover · 02-22-2022, 02:26 PM

I had a aftermarket set (3.25)yrs ago and it was for the Model A and the earlier '32's.

38 coupe · 02-26-2022, 03:21 PM

I have seen 3.25 offered aftermarket for 35-48 with six spline pinions. I had a friend with this ratio in a stock 47 sedan and it wasn't optimal, not terrible but not optimal.

drolston · 02-26-2022, 05:43 PM

Sponsored Links (Register now to hide all advertisements)

I got 3.25 gears from Van Pelt for my '41, as a cheaper and more reliable alternative to a two speed rear end. They got me the highway cruise RPM I wanted and are fine in traffic and on hills, - BUT, I have a 284 inch engine with a ton of torque. The 3.25 will probably be too tall for a stock engine.

alanwoodieman · 02-26-2022, 05:48 PM

3:25 is just about too tall for my 51 Merc engine in my truck. I ran a 3:50 that I liked better but changed to the 3:25 for speed or so I thought. for hill starts it is tough on the clutch and the torgue curve is off, but boy will it rum down the highway-run away and left my buddy in his new chev pick up. he said 80 mph was too fast for the highway

Ford Freak · 02-27-2022, 09:27 AM

I am very happy w/the 3:54's that I put in my '37 w/a stock 221 cu. in. engine. I got the gears, install/rebuild rear end kit,& spline adaptor from Mac VanPelt. I recommend them as they sell good quality parts at a good price along w/good customer service! - F F

Old Redneck · 02-27-2022, 10:20 AM

A friend in WV. had 3:25 in a 39 coupe and on the interstate he run 70 and no problem in the mountains. Another friend put 3:25 in a 40, 2 door sdn. stock engine and he loves them. Lots of hills around here. I see no problem using 3:25 in a flathead.

Juergen · 02-27-2022, 10:58 AM

It works better with a wide ratio (29 tooth cluster) transmission.

alanwoodieman · 02-27-2022, 02:13 PM

with the 3:25 gear set, go to the steepest hill, stop and start off and then let us know how it does

Old Redneck · 02-27-2022, 04:30 PM

No problem if you start in low gear. You would be surprise how nice they work. I was.
.

johnneilson · 02-27-2022, 06:23 PM

Well, the question was not answered, thanks.
FWIW, I use 3.25 in the race car QC Halibrand rear end.
At Bonneville, ran 174 mph with a slightly modified Model "B" motor and 2 speed trans.

J

STEVE O · 02-27-2022, 06:55 PM

Not apples to apples, but I owned a 50 Plymouth for 36 years. 90 hp which is comparable to the stock 40 v8 but with more torque. I swapped from 3:90 gears to 3:70 gears, then 3:70 to 3:54. That worked out very well with out having to slip the clutch a lot. I know I would not have been happy with 3:25 gears where I live. The 15" tires I had on it was comparable to 6:00x16s. Just my experience on a similar swap. I then added overdrive and it would cruise at 70 nice.
Stay safe
Steve

aussie merc · 02-27-2022, 07:04 PM

what we seem to be missing here is tyre size or dia as this often has a greater effect on how the vehicle drives as there is a large difference between a 700/16 and a 550/15 To find the optimum for you start with tire rpm x at what ever you want to cruise at then calculate backwards to eng sweet range generally the taller the tire the deeper the ratio required

02-22-2022, 01:13 PM	#1
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,181	rear gears 3.25 and 3.27 I have been looking for information on when the 3.25 and 3.27 gears were available. These would be for V8 "straddle mount" rearends. And what cars they were offered in. Thanks, John __________________ As Carroll Smith wrote; All Failures are Human in Origin.

02-22-2022, 01:45 PM	#2
19Fordy Senior Member Join Date: May 2010 Location: Coral Springs FL Posts: 11,604	Re: rear gears 3.25 and 3.27 What does "straddle mount" mean?

02-22-2022, 02:26 PM	#4
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,833	Re: rear gears 3.25 and 3.27 I had a aftermarket set (3.25)yrs ago and it was for the Model A and the earlier '32's.

02-26-2022, 03:21 PM	#5
38 coupe Senior Member Join Date: May 2010 Location: South Texas Posts: 2,040	Re: rear gears 3.25 and 3.27 I have seen 3.25 offered aftermarket for 35-48 with six spline pinions. I had a friend with this ratio in a stock 47 sedan and it wasn't optimal, not terrible but not optimal.

02-26-2022, 05:43 PM	#6
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,811	Re: rear gears 3.25 and 3.27 Sponsored Links (Register now to hide all advertisements) I got 3.25 gears from Van Pelt for my '41, as a cheaper and more reliable alternative to a two speed rear end. They got me the highway cruise RPM I wanted and are fine in traffic and on hills, - BUT, I have a 284 inch engine with a ton of torque. The 3.25 will probably be too tall for a stock engine.

02-26-2022, 05:48 PM	#7
alanwoodieman Senior Member Join Date: May 2010 Location: upstate SC Posts: 3,000	Re: rear gears 3.25 and 3.27 3:25 is just about too tall for my 51 Merc engine in my truck. I ran a 3:50 that I liked better but changed to the 3:25 for speed or so I thought. for hill starts it is tough on the clutch and the torgue curve is off, but boy will it rum down the highway-run away and left my buddy in his new chev pick up. he said 80 mph was too fast for the highway

02-27-2022, 09:27 AM	#8
Ford Freak Senior Member Join Date: Feb 2013 Location: Pittsford NY. USA Posts: 1,249	Re: rear gears 3.25 and 3.27 I am very happy w/the 3:54's that I put in my '37 w/a stock 221 cu. in. engine. I got the gears, install/rebuild rear end kit,& spline adaptor from Mac VanPelt. I recommend them as they sell good quality parts at a good price along w/good customer service! - F F __________________ 1952 Ford F1 !956 Fairlane Club Sedan 1965 Falcon Sprint 2007 Mustang GT

02-27-2022, 10:20 AM	#9
Old Redneck Senior Member Join Date: May 2010 Location: Waynesburg,Pa. Posts: 1,966	Re: rear gears 3.25 and 3.27 A friend in WV. had 3:25 in a 39 coupe and on the interstate he run 70 and no problem in the mountains. Another friend put 3:25 in a 40, 2 door sdn. stock engine and he loves them. Lots of hills around here. I see no problem using 3:25 in a flathead.

02-27-2022, 10:58 AM	#10
Juergen Senior Member Join Date: May 2010 Posts: 527	Re: rear gears 3.25 and 3.27 It works better with a wide ratio (29 tooth cluster) transmission.

02-27-2022, 02:13 PM	#11
alanwoodieman Senior Member Join Date: May 2010 Location: upstate SC Posts: 3,000	Re: rear gears 3.25 and 3.27 with the 3:25 gear set, go to the steepest hill, stop and start off and then let us know how it does

02-27-2022, 04:30 PM	#12
Old Redneck Senior Member Join Date: May 2010 Location: Waynesburg,Pa. Posts: 1,966	Re: rear gears 3.25 and 3.27 No problem if you start in low gear. You would be surprise how nice they work. I was. .

02-27-2022, 06:23 PM	#13
johnneilson Senior Member Join Date: Jun 2010 Location: 34.22 N 118.36 W Posts: 1,181	Re: rear gears 3.25 and 3.27 Well, the question was not answered, thanks. FWIW, I use 3.25 in the race car QC Halibrand rear end. At Bonneville, ran 174 mph with a slightly modified Model "B" motor and 2 speed trans. J __________________ As Carroll Smith wrote; All Failures are Human in Origin.

02-27-2022, 06:55 PM	#14
STEVE O Senior Member Join Date: May 2010 Location: QUICKSBURG VA Posts: 735	Re: rear gears 3.25 and 3.27 Not apples to apples, but I owned a 50 Plymouth for 36 years. 90 hp which is comparable to the stock 40 v8 but with more torque. I swapped from 3:90 gears to 3:70 gears, then 3:70 to 3:54. That worked out very well with out having to slip the clutch a lot. I know I would not have been happy with 3:25 gears where I live. The 15" tires I had on it was comparable to 6:00x16s. Just my experience on a similar swap. I then added overdrive and it would cruise at 70 nice. Stay safe Steve

02-27-2022, 07:04 PM	#15
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,125	Re: rear gears 3.25 and 3.27 what we seem to be missing here is tyre size or dia as this often has a greater effect on how the vehicle drives as there is a large difference between a 700/16 and a 550/15 To find the optimum for you start with tire rpm x at what ever you want to cruise at then calculate backwards to eng sweet range generally the taller the tire the deeper the ratio required