3.73 w/ posi or my ignition - The 1947 - Present Chevrolet & GMC Truck Message Board Network

xtreme80 · 03-28-2007, 03:46 PM

On one hand, I've got a bad ignition miss. The truck will sputter and idle rough because of it.

On the other hand, I can get my hands on a complete 3.73 rear end with posi, for about the same price as the ignition system.

Can't do both right now.

What would you do?

Malo83 · 03-28-2007, 03:55 PM

So what would you be replacing on the ignition system that would cost as much as a posi rear end

No brainer

the posi!!!

ureckme · 03-28-2007, 03:59 PM

Well if it don't run you can't drive it over to my house to tell you whats really wrong with it. lol If you can get the miss fixed on the cheep than get the rear end too. I just got my rear end 12 bolt 3.73 w/posi off creigslist for $150. Got it from a guy in Chandler. It has new Richmond gears and new posi and i'm putting it in this weekend.

Matt

82c10 · 03-28-2007, 04:25 PM

for less than $60 you can have a new HEI >It was stolen about 5-6 years ago (before Ryan owned it) so the insurance company paid for it. It was recovered w/ no damage but it has a rebuilt title now.
get some store brand wires from autozone, or other chain parts store-less than $20
and sparkplugs can be had from wal-mart for around $13
60+20+13= $93, fix it first, you can get performance parts later

Srubydo1986 · 03-28-2007, 05:10 PM

posi, ignition can be fixed anytime how offen do you get a 12 bolt rear for near to nothin

82c10 · 03-28-2007, 05:46 PM

Quote:

Originally Posted by Srubydo1986

posi, ignition can be fixed anytime how offen do you get a 12 bolt rear for near to nothin

ok, we'll i can probably get at least 2-3 of them for less then $100 each, i can go get another posi 8.8 disc brake rear with 3.55's for less then $100, and when they roll some more in i can get another 3.73 rearend for less then $100, and yes i am sure i can find these, you just have to look, to me $100 is alot, coming from what i have done i will fix what i have before i buy a performance part for it

Rc 415 · 03-28-2007, 06:02 PM

Quote:

Originally Posted by 82c10

ok, we'll i can probably get at least 2-3 of them for less then $100 each, i can go get another posi 8.8 disc brake rear with 3.55's for less then $100, and when they roll some more in i can get another 3.73 rearend for less then $100, and yes i am sure i can find these, you just have to look, to me $100 is alot, coming from what i have done i will fix what i have before i buy a performance part for it

If I sent you 100+ shipping would you hook me up with one??

82c10 · 03-28-2007, 06:08 PM

Quote:

Originally Posted by Rc 415

If I sent you 100+ shipping would you hook me up with one??

if i had the time to go pull one, and ship it, i would, but i don't have time with school and work these days, maybe in a couple months

82c10 · 03-28-2007, 05:47 PM

and according to his sig he already has a 3.73 rearend with posi

Rc 415 · 03-28-2007, 06:19 PM

mabye i could compensate you for the labor

Pyrotechnic · 03-28-2007, 06:59 PM

Are you sure you dont just need a cap/rotor/coil/wires/plugs ? If the HEI is really old the mechanical advance mechanism will be very sloppy and will cause the motor to run less than great sometimes during part throttle and acceleration as the advance will be coming in and out constantly. You can probably find a used in good shape for not too much.

I had one that had a really sloppy and worn out advance mechanism, but even then the truck still pretty decently with a good cap, rotor, coil, wires, and plugs. Sometimes you would stomp down on it and acceleration would be mediocre and other times it would bark the tires like crazy when it hit 2nd gear. That was rare though and the truck ran great for the most part.

Unless the mechanism is seriously damaged, like the weights stuck completely in any given position, it sounds like it might just need a tune up.

jermasaurus · 03-28-2007, 10:58 PM

umm... thats a no brainer. Fix the ignition!!! You must get the truck running correctly before buying things that are not necessary.

What is wrong with the ignition? Your "bad miss" can be anything from a plug/wire to a flattened cam lobe.

Besides, leaving the truck running poorly can only amount to worse problems. These problems can be more serious on emisions vehicles- like damage to catalytic converters.

Either way, I would worry about getting the truck running properly first

Good luck
-Jeremy

boatpuller · 03-28-2007, 11:07 PM

i'm gonna have to agree with jermasaurus.man you gotta be able to get from point a to point b,if it isn't a daily driver then it might be different.get that bugger running right then worry about the hind end.

xtreme80 · 03-28-2007, 11:10 PM

The truck has an ignition miss. It's not bad, but it bothers me. It's a very slight miss and only does it about every 10 seconds when idling. It's never come close to dying or anything.

It's not a worn cam lobe. The engine is a GM crate with about 1000 miles on it.

I guess I posted this wrong. It's not like it's about to break, it's just a little shutter in the ignition when sitting at a stop light. Nothing major.

Someone pointed out my sig saying I already had the 3.73. Well, I put that up there the day I was supposed to go get the rear end. That fell through, but I can get it for sure tomorrow.

And yes, the new rear end is a rebuilt one with 0 miles and posi for about 100 bucks.

Pyrotechnic · 03-29-2007, 04:08 AM

Quote:

Originally Posted by xtreme80

The truck has an ignition miss. It's not bad, but it bothers me. It's a very slight miss and only does it about every 10 seconds when idling. It's never come close to dying or anything.

It's not a worn cam lobe. The engine is a GM crate with about 1000 miles on it.

I guess I posted this wrong. It's not like it's about to break, it's just a little shutter in the ignition when sitting at a stop light. Nothing major.

Someone pointed out my sig saying I already had the 3.73. Well, I put that up there the day I was supposed to go get the rear end. That fell through, but I can get it for sure tomorrow.

And yes, the new rear end is a rebuilt one with 0 miles and posi for about 100 bucks.

Thats a great price for that, as long as the rebuilt was done right. A new posi unit alone costs more than that to begin with.

slugish · 03-29-2007, 10:16 PM

Is your distributer or msd box grounded to the engine block. Very important . found out the hard way

ureckme · 03-29-2007, 02:47 AM

sounds like a lean miss or the carb has a drip that makes it do that

jermasaurus · 03-29-2007, 10:51 PM

Hope I didn't come off sounding rude. It sounded like a typical situation I see at work here and there. But you say it only misses once every 10 sec or so? Did you use new plugs/wires/cap/rotor when you dropped that morot in?

xtreme80 · 03-29-2007, 11:13 PM

Ok guys, I went ahead and did the ignition. I got a new cap, rotor, and HEI coil.

I hooked it up to the multi and it showed teh coil as being bad. Also, the old cap and rotor were cheap autozone parts, so I went with some good stuff from work.

With all 3 items, I payed about 40 bucks. Gotta love shop discounts.

But all this fixed the problem. Turns out I had another problem that was slowly developing that was also directly related to this. At high RPM the engine was hesitating BAD. It felt as if it was starved for fuel, or as if I was letting off the gas for a minute, then back on. It was getting worse and worse, and these new parts fixed that as well.

I guess the rear end will have to wait. There's no sense in having it if the ignition is fubar'd

03-28-2007, 03:46 PM	#1
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	3.73 w/ posi or my ignition On one hand, I've got a bad ignition miss. The truck will sputter and idle rough because of it. On the other hand, I can get my hands on a complete 3.73 rear end with posi, for about the same price as the ignition system. Can't do both right now. What would you do?

03-28-2007, 03:55 PM	#2
Malo83 Cruzzzn' Vet Join Date: Jan 2005 Location: Porterville,Ca. Posts: 1,918	Re: 3.73 w/ posi or my ignition So what would you be replacing on the ignition system that would cost as much as a posi rear end No brainer the posi!!!

03-28-2007, 03:59 PM	#3
ureckme ureckmefixit2@cox.net Join Date: Dec 2004 Location: Mesa AZ. (Phoenix) Posts: 1,284	Re: 3.73 w/ posi or my ignition Well if it don't run you can't drive it over to my house to tell you whats really wrong with it. lol If you can get the miss fixed on the cheep than get the rear end too. I just got my rear end 12 bolt 3.73 w/posi off creigslist for $150. Got it from a guy in Chandler. It has new Richmond gears and new posi and i'm putting it in this weekend. Matt __________________ That's U RECK ME FIX it 2 74 Chevy Short Bed 355ci Sportsman II 64cc Angle Plug Crower Custom Grind .462in .486ex Dyno Test 422hp @ 5600 And it's got a Holley 3.73 Gears 12 Bolt 3.73 w/Posi 700R4 Going In I'm a Body Man So There! That's why it's not painted

03-28-2007, 04:25 PM	#4
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	Re: 3.73 w/ posi or my ignition for less than $60 you can have a new HEI >It was stolen about 5-6 years ago (before Ryan owned it) so the insurance company paid for it. It was recovered w/ no damage but it has a rebuilt title now. get some store brand wires from autozone, or other chain parts store-less than $20 and sparkplugs can be had from wal-mart for around $13 60+20+13= $93, fix it first, you can get performance parts later __________________ *SWB Stands for Short Wide Bed*

03-28-2007, 05:10 PM	#5
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: 3.73 w/ posi or my ignition posi, ignition can be fixed anytime how offen do you get a 12 bolt rear for near to nothin __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

03-28-2007, 05:47 PM	#9
82c10 needin' money Join Date: May 2005 Location: Chickasha, Oklahoma Posts: 1,106	Re: 3.73 w/ posi or my ignition and according to his sig he already has a 3.73 rearend with posi __________________ *SWB Stands for Short Wide Bed*

03-28-2007, 06:19 PM	#10
Rc 415 Flat Black, & Chrome! Join Date: Jan 2007 Location: San Francisco Posts: 852	Re: 3.73 w/ posi or my ignition mabye i could compensate you for the labor __________________ 1983 Chevy C10 Stepside Sold http://s69.photobucket.com/albums/i76/rc_415/

03-28-2007, 06:59 PM	#11
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: 3.73 w/ posi or my ignition Are you sure you dont just need a cap/rotor/coil/wires/plugs ? If the HEI is really old the mechanical advance mechanism will be very sloppy and will cause the motor to run less than great sometimes during part throttle and acceleration as the advance will be coming in and out constantly. You can probably find a used in good shape for not too much. I had one that had a really sloppy and worn out advance mechanism, but even then the truck still pretty decently with a good cap, rotor, coil, wires, and plugs. Sometimes you would stomp down on it and acceleration would be mediocre and other times it would bark the tires like crazy when it hit 2nd gear. That was rare though and the truck ran great for the most part. Unless the mechanism is seriously damaged, like the weights stuck completely in any given position, it sounds like it might just need a tune up.

03-28-2007, 10:58 PM	#12
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	Re: 3.73 w/ posi or my ignition umm... thats a no brainer. Fix the ignition!!! You must get the truck running correctly before buying things that are not necessary. What is wrong with the ignition? Your "bad miss" can be anything from a plug/wire to a flattened cam lobe. Besides, leaving the truck running poorly can only amount to worse problems. These problems can be more serious on emisions vehicles- like damage to catalytic converters. Either way, I would worry about getting the truck running properly first Good luck -Jeremy __________________ 79 Jimmy slammed AKA James Down Last edited by jermasaurus; 03-28-2007 at 10:59 PM.

03-28-2007, 11:07 PM	#13
boatpuller Registered User Join Date: Sep 2005 Location: Sun City West, Az Posts: 3,822	Re: 3.73 w/ posi or my ignition i'm gonna have to agree with jermasaurus.man you gotta be able to get from point a to point b,if it isn't a daily driver then it might be different.get that bugger running right then worry about the hind end. __________________ " Never look up a dead dogs butt."

03-28-2007, 11:10 PM	#14
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: 3.73 w/ posi or my ignition The truck has an ignition miss. It's not bad, but it bothers me. It's a very slight miss and only does it about every 10 seconds when idling. It's never come close to dying or anything. It's not a worn cam lobe. The engine is a GM crate with about 1000 miles on it. I guess I posted this wrong. It's not like it's about to break, it's just a little shutter in the ignition when sitting at a stop light. Nothing major. Someone pointed out my sig saying I already had the 3.73. Well, I put that up there the day I was supposed to go get the rear end. That fell through, but I can get it for sure tomorrow. And yes, the new rear end is a rebuilt one with 0 miles and posi for about 100 bucks.

03-29-2007, 10:16 PM	#16
slugish Slugish Join Date: Jan 2005 Location: Earlysville, Va. Posts: 1,024	Re: 3.73 w/ posi or my ignition Is your distributer or msd box grounded to the engine block. Very important . found out the hard way

03-29-2007, 02:47 AM	#17
ureckme ureckmefixit2@cox.net Join Date: Dec 2004 Location: Mesa AZ. (Phoenix) Posts: 1,284	Re: 3.73 w/ posi or my ignition sounds like a lean miss or the carb has a drip that makes it do that __________________ That's U RECK ME FIX it 2 74 Chevy Short Bed 355ci Sportsman II 64cc Angle Plug Crower Custom Grind .462in .486ex Dyno Test 422hp @ 5600 And it's got a Holley 3.73 Gears 12 Bolt 3.73 w/Posi 700R4 Going In I'm a Body Man So There! That's why it's not painted

03-29-2007, 10:51 PM	#18
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	Re: 3.73 w/ posi or my ignition Hope I didn't come off sounding rude. It sounded like a typical situation I see at work here and there. But you say it only misses once every 10 sec or so? Did you use new plugs/wires/cap/rotor when you dropped that morot in? __________________ 79 Jimmy slammed AKA James Down

03-29-2007, 11:13 PM	#19
xtreme80 Wishin' I had more money! Join Date: Feb 2007 Location: Eugene, OR Posts: 1,242	Re: 3.73 w/ posi or my ignition Ok guys, I went ahead and did the ignition. I got a new cap, rotor, and HEI coil. I hooked it up to the multi and it showed teh coil as being bad. Also, the old cap and rotor were cheap autozone parts, so I went with some good stuff from work. With all 3 items, I payed about 40 bucks. Gotta love shop discounts. But all this fixed the problem. Turns out I had another problem that was slowly developing that was also directly related to this. At high RPM the engine was hesitating BAD. It felt as if it was starved for fuel, or as if I was letting off the gas for a minute, then back on. It was getting worse and worse, and these new parts fixed that as well. I guess the rear end will have to wait. There's no sense in having it if the ignition is fubar'd



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