hook fan on an 837 alt

**LITTLE TOMMIE** · #1 05-23-2011, 08:23 PM

i have a few original 837 alternators and not all of them have the hook fan, so my question is not all 837 alternators had the hook fan right

**mockingbird812** · #2 05-23-2011, 11:58 PM

I can only speak from experience. My '70 Deuce had its original -837 alt but, the fan did not have the hook on one of the blades. I guess it could have been replaced (the fan) but unlikely. I did put a hook fan on the alt. as I had understood that to be correct.

**Ls6 Ragtop** · #3 05-24-2011, 12:16 AM

Sam,
I would have left your alternator alone. Although I've seen some 70 model year alternators with the pronounced hook on them, most don't have it. I use the hook style on 68-69 dates and the other smaller tab style on 70's. My take is the hook style is earlier than the same profile fan without.
Chris

**mockingbird812** · #4 05-24-2011, 12:24 AM

Good to know Chris. I am interested in other's thots too.

**LITTLE TOMMIE** · #5 05-24-2011, 12:37 AM

i have a 8 K 24 and it has the hook and i have a 8 M ? and a 9 A ? and a 9 E 27 with out hooks, i have a few others , i well have to check them, but thats what i know for sure.
i just wanted some other imput, these are not restored and i freaked out thinking because they didn't have the hook that they were wrong

JohnZ · #6 05-31-2011, 12:44 AM

My known-original 837 alternator (9B19) has the "hook" fan.

**LITTLE TOMMIE** · #7 06-01-2011, 01:10 PM

could there have been two different supplyers making these for GM at the time

**x77-69z28** · #8 06-01-2011, 09:29 PM

THATS WHAT I WAS THINKING TOMMIE. I SENT YOU A PM.
BUDDY

**mockingbird812** · #9 06-01-2011, 10:29 PM

There is a unique mark on the back of the "hooked" fan blade that i did not see on the original fan blade on my '70 837 alternator. Can't describe it as it is not in front of me, but have seen it on other "hooked" blades.