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Old 08-20-2002, 05:18 AM
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Default Need help with Clutch Set selection-350/SM465 swap

Here's my application.

1988 V8 350TBI (and flywheel)
1974 SM465/NP205 (and bellhousing)

Which clutch to get? I know I want a 12" disc, with 10 spline at 1-1/8", but what year application should I get? Summitracing.com shows two different p/n's for those years of parts. For years 55-80, they offer a RAM OEM replacement with p/n RAM-88770, and for years 81-89, they offer a RAM OEM replacement with p/n RAM-88793.

I want the clutch to be a diaphram type, because I'm using hydraulic linkage. No other info is offered on their web page, could it be the only difference is B & B vs. Diaphram or do you think there is a difference in pressure plate height or amount of throw needed to disengage, etc?

What advice can you guys offer?

Chris
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Old 08-20-2002, 06:56 AM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

[img]images/icons/crazy.gif[/img] I've mentioned this before a few times[img]images/icons/smile.gif[/img] and yes, I AM kind of an eccentric old man in some ways,[img]images/icons/crazy.gif[/img] but I KNOW WHAT WORKS![img]images/icons/tongue.gif[/img] After having no less than NINE FS GM pickups; five of which have had the 350/SM465 combination, I have this to tell you:[img]images/icons/tongue.gif[/img] "I got real tired of reaching down onto the floor and picking up the clutch pedal that had physically broken off of the bellcrank;[img]images/icons/frown.gif[/img] or straightening bent pieces of linkage;[img]images/icons/frown.gif[/img] or tearing out the whole clutch because the excessive spring pressure had failed a throwout finger pivot point;[img]images/icons/frown.gif[/img] or having the throwout fork bend and become innefective.[img]images/icons/frown.gif[/img] WHAT I'VE LEARNED is that when you toss a new B&B 12" clutch in there, CUT THREE SPRINGS OUT,[img]images/icons/shocked.gif[/img] one from each group.....not the outside spring, pick one of the center springs and do the same one in each group......so you have 75% of the pressure. It will hold just fine and that way you won't break everything AND you won't wear out the thrust bearing on the crankshaft.[img]images/icons/frown.gif[/img][img]images/icons/crazy.gif[/img] Hey....I warned you that I was eccentric...[img]images/icons/crazy.gif[/img] but I got real tired of dumping clutches out of my pickups.[img]images/icons/tongue.gif[/img][img]images/icons/frown.gif[/img][img]images/icons/smile.gif[/img]I've long been of the opinion that a 12" B&B clutch was "overkill" for a Chev-Lay 350.[img]images/icons/tongue.gif[/img] Heck, we used to put these SAME clutches in Dodge trucks which had the Chrysler 392 Double-Rocker Hemi engine in them; engines that had some REAL TORQUE, not like these leetle baby bowties.[img]images/icons/crazy.gif[/img]
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Old 08-20-2002, 07:54 AM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

Yes, I know I definelty want the diaphragm type. I'm using hydraulic linkage and using a B&B is off-limits!

Thanks, and I think I found my source of parts. My local FleetsPride store has what I need in-stock, for less money than the local auto-bone and similar store. AND its more complete!!!

Chris
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Old 08-20-2002, 03:26 PM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

I use a stock replacement 11" B&B. Tossed out a 10.5" diaphram style after a few months - started slipping for some reason (that's another story). And, I run a hydraulic setup with no problems. I have an '86 and newer externally balanced SBC with the one piece rear main. I used a clutch that is matched to the '77 tranny and it bolted up fine. The pressure plate patterns were the same between the two different flywheels. What I discovered was, if you wanted a '77 10.5" clutch, it was a diaphram type. 11", B&B. I hadn't investigated the 12" clutch - now my interest is piqued [img]images/icons/smile.gif[/img]
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Old 08-20-2002, 03:37 PM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

I hope no one minds me poking into this post, but I was just wondering if anyone would share how they like thier SM465. I am currently in the homework stages of a 35 conversion, and I am looking for a transmition that will go along with. Any opinions on the subject???
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Old 08-20-2002, 04:48 PM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

I like mine just fine. Heavy sucker though. I had a newbie right seat last weekend and wow'd him with the granny low first gear. Most stuff I tackle, I don't even need it (crawl ratio works out to 64:1) - but when you need the control, it's great to have it there. I need to get myself out to some wheelin' spots that have some low level rock crawling involved. Then I can reap the benefits.

Back on my previous post - sittin' here thinkin' about it, I'm pretty sure I got the sizes wrong [img]images/icons/smile.gif[/img] It's been long enough since I did the work, things have clouded over. Maybe it's just cause I'm tired... Anyways, I remember the size of the flywheel being in the 14" range, so I hoped the B&B clutch wouldn't be a problem. So, I gotta be off on the clutch size - it must have been a 12" disc. So, the diaphram one was most likely 11". I'd look this junk up to be sure, if I wasn't feeling so lazy at the moment - sorry [img]images/icons/smile.gif[/img]
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Old 08-21-2002, 04:23 AM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

Yea a 14" flywheel gets a 12" clutch. The disc measures approx. 11.75", but there is some tolerance in that number from all the manufacturers. Some companies short change you (no names mentioned), but I like the Luk setup. I'm picking up one of their diaphragm types (12") later this morning for about $100. It's a complete kit too, Pressure Plate, Disc, Through Out Bearing, Pilot Bearing and Alignment Tool. Can't beat that!

Chris
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Old 08-21-2002, 09:19 PM
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Default Re: Need help with Clutch Set selection-350/SM465 swap

[img]images/icons/tongue.gif[/img] Oh yeah......and one more thing...[img]images/icons/crazy.gif[/img]...we also use STUDS in the bellhousing for the tranny to slip over and bolt up.[img]images/icons/tongue.gif[/img] It seems like every used pickup I buy with an SM465 has the threaded holes in the aluminum bellhousing washed out to a certain extent.[img]images/icons/frown.gif[/img] I make studs which screw all the way in and take advantage of the still-unused threaded area that is DEEP in the bellhousing, then I lock 'em in with Lok-Tite. Actually, the studs make it easy to slide the SM465 into place.[img]images/icons/smile.gif[/img] If you have even ONE hair on your head you'll do the same thing.[img]images/icons/tongue.gif[/img] Besides, it's cooler.[img]images/icons/cool.gif[/img][img]images/icons/laugh.gif[/img]
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