Previous Thread
Next Thread
Print Thread
Big block 727 question #2712873
11/04/19 11:40 PM
11/04/19 11:40 PM
Joined: Jan 2003
Posts: 5,587
Detroit area
6PAX Offline OP
master
6PAX  Offline OP
master

Joined: Jan 2003
Posts: 5,587
Detroit area
Can someone tell me what the difference is between a 440 non-hp 727 and a 440 hp 727? The transmissions I am looking at in particular are 3681056 and 057 for late 1972 and 1973 cars.

Re: Big block 727 question [Re: 6PAX] #2712884
11/05/19 03:48 AM
11/05/19 03:48 AM
Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar Offline
master
451Mopar  Offline
master

Joined: May 2008
Posts: 5,399
Aurora, Colorado
I don't know by part number, but the HP trans usually has the 4-pinion front planetary gear and 4-clutch front drum, and some non-HP just have 3-Pinion, 3-Clutch Drum.
Not sure if the governor is a different shift point.
The parts interchange, so no problem upgrading a low performance to HP specs.
If in the budget, Bolt-in super sprag and Billet front drum (5-clutch) are great upgrades for safety and performance.

Re: Big block 727 question [Re: 451Mopar] #2712905
11/05/19 08:36 AM
11/05/19 08:36 AM
Joined: Jan 2003
Posts: 4,276
Florida
blewbyu Offline
master
blewbyu  Offline
master

Joined: Jan 2003
Posts: 4,276
Florida
Originally Posted by 451Mopar
I don't know by part number, but the HP trans usually has the 4-pinion front planetary gear and 4-clutch front drum, and some non-HP just have 3-Pinion, 3-Clutch Drum.
Not sure if the governor is a different shift point.
The parts interchange, so no problem upgrading a low performance to HP specs.
If in the budget, Bolt-in super sprag and Billet front drum (5-clutch) are great upgrades for safety and performance.



I believe only Hemi trans had the 4 gear planetary?

Re: Big block 727 question [Re: 6PAX] #2713034
11/05/19 03:10 PM
11/05/19 03:10 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Offline
Too Many Posts
John_Kunkel  Offline
Too Many Posts

Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
The earlier 440 HP had 4-pinion planetaries front and rear, 440 standard performance had them in the front only. Any 440-4 will have 4-disc front and rear clutches. Governor is different in the HP.

In '72 most 440's had the 4-pinion in the front only.



The INTERNET, the MISinformation superhighway






Powered by UBB.threads™ PHP Forum Software 7.7.1