4.3 swap has finally begun - Page 4 - JeepForum.com
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post #46 of 1069 Old 08-04-2011, 04:58 AM
jeepdude1987
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Quote:
Originally Posted by 1SASjeepster View Post
Jeepdude1987,
Thanks. I think I have just added your word "craptacular" to my vocabulary...


...I realized my wife and children were going to be driving this vehicle at some point so I wanted better brakes. My wife has a Grand Cherokee. I realized we had the same D35 rear axles so I scrapped the YJ's drum brakes for ZJ rear disc brakes. It was almost half as much as some aftermarket jobs I see out there, and much easier to get parts for.
Take care,
I don't know exactly where I got that word, but I figure it fits, and I combine words like that all the time so feel free to use it where ever it seems to fit.

About the ZJ rear discs, did you change out the proportioning valve or something? I know that discs require more pressure, and I had read that guys who use the 8.8 from explorers have to do something to address this problem.


1987 Wrangler YJ RED 4.2 5-speed, NP231, BFG 31x10.5R15 AT/KO on 15x8 gambler wheels.
Caution!!! Under construction!!!!!! Caution!!!
Finishing a 4.0 Cyl.head swap, Just got an AX-15 NP231J combo to replace the busted t-case and craptacular BA10/5. Adding Nutter bypass. Probably more to come before it is back as a DD!
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post #47 of 1069 Old 08-04-2011, 06:35 AM
1SASjeepster
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Jeepdude1987,
You have to add a proportioning valve to your system. They are pretty inexpensive and easy to connect.

Take care,
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post #48 of 1069 Old 08-04-2011, 09:23 AM Thread Starter
YJames90
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Quote:
Originally Posted by 1SASjeepster View Post
Jeepdude1987,
You have to add a proportioning valve to your system. They are pretty inexpensive and easy to connect.

Take care,
When I put in the 8.8 with disc brakes the valve didnt need any adjustments.

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #49 of 1069 Old 08-04-2011, 05:33 PM Thread Starter
YJames90
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This is it for today. Just picked up the motor mounts and clamped one on

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #50 of 1069 Old 08-05-2011, 03:45 AM
1SASjeepster
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YJames90,
Make sure of your measurements. With my 4.3, I used the mounts in the opposite way. This allowed the engine to sit lower in the frame, which gave me plenty of space for everything. It probably won't make a big difference, just be sure of your measurements. I can't wait to see how your project will turn out! I hope the photos help.

Take care,
Attached Thumbnails
100_3593.jpg   100_3595.JPG  

Last edited by 1SASjeepster; 08-05-2011 at 03:47 AM. Reason: To make it easier to understand...
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post #51 of 1069 Old 08-05-2011, 03:58 AM Thread Starter
YJames90
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^^^^^^^^
Thanks for that Idea. Going to do alot of measureing tomorrow

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #52 of 1069 Old 08-05-2011, 08:01 AM
JeeperDon
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James, take the fenders off. It's a LOT easier to get things done/welded.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #53 of 1069 Old 08-05-2011, 08:50 AM Thread Starter
YJames90
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Originally Posted by JeeperDon View Post
James, take the fenders off. It's a LOT easier to get things done/welded.
Actually I had planned to do that tonight. First I have to go to the Chevy dealer to get the gasket that goes inbetween the trans and TC. The actually have 2 in stock.
Don, Did you have to do anything else to the oil filter relocate mod? I just bought the nipple and screwed on the filter

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #54 of 1069 Old 08-05-2011, 07:13 PM Thread Starter
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I think Im down to almost last of the grunt work.
Fenders are off

Motor mounts are on

Bolt in wrong way

Bolt in right way

Gasket on

Ready to go in tomorrow

Thats it for tonight

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #55 of 1069 Old 08-05-2011, 09:04 PM
JeeperDon
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Don, Did you have to do anything else to the oil filter relocate mod? I just bought the nipple and screwed on the filter
James, I did just what you did for the filter. There are two filter styles for that motor, a larger 4wd one and a shorter 2wd. I've used both over the years (did my swap in Nov '04). I tend to use the larger one normally.

I see you have a steel oil pan. Mine is an aluminum casting, which fortunately I've never hit on a rock. The bolt patterns are different or I would have switch to steel.

You have the same mount as I used. The 1/4" lowering of the motor I had to do was done by shaving 1/4" of the rubber on the top ones.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #56 of 1069 Old 08-06-2011, 04:44 PM Thread Starter
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Lets just start by that I am exhausted! Have been out in the garage since 9:30 am and skipped lunch.
The 4.3 is now clamped in by the motor mounts to the frame in and will be welded in tomorrow




Perfect hood clearance

Good radiator space

Hood shuts

Chevy!!


Some how, Im not sure but both drive shafts fits perfect. Maybe because I an stretched an inch front and rear on the axles

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #57 of 1069 Old 08-07-2011, 07:44 AM Thread Starter
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Now a question about the fuel pump. Being that I am swapping TBI to TBI can I use the YJ pump? I pulled the S10 pump if needed.
Heres the specs for each pump. Close enough?

YJ pump =
Fuel Pump Specifications
Walbro Part Number: 550
Minimum Current: 12 Volts
Operating Pressure: 17 PSI
Minimum Flow @ Outlet: 28 GPH Low Pressure
Fuel Pump Location: In-Tank



S10 pump=
Walbro Part Number: 5CA401
Minimum Current: 12 Volts
Operating Pressure: 12 PSI
Minimum Flow @ Outlet: 29 GPH Low Pressure
Fuel Pump Location: In-Tank

Quote:
Originally Posted by Poke View Post
Spring Over is not for you.... yet





My 2.5 to 4.3 swap thread
http://www.jeepforum.com/forum/f12/4...begun-1237704/
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post #58 of 1069 Old 08-07-2011, 09:45 AM
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The last S10 fuel pump I bought was $300+. The YJ fuel pump I priced was about $120. So for the sake of future repair costs, I would give the YJ pump a try first and see how it works. Worse case you have to drop a tank and replace. It might just need an adjustable pressure regulator to give the TBI the pressure it needs.

Adapting the S10 pump to a YJ gas tank might also make for an interesting can of worms, considering tank designs and ,in some cases, capacities are different. I'm also not sure about the shape of the opening in the tank.
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post #59 of 1069 Old 08-07-2011, 12:04 PM
JeeperDon
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James, I didn't read back to see what year your S-10 was, but my '02 S-10 said I should see 60-66 PSI at the motor's fuel test nipple. My year YJ had a 39 PSI pump. I replaced the YJ pump in the tank with a piece of fuel line and used an external pump. I have an MSD 2225 (or is it 2555?) model from Summit for less than $100. I don't know if any of this will help or applies, but that's my story on fuel pumps.

'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
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post #60 of 1069 Old 08-07-2011, 12:34 PM
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Don, I believe that the CPFI and MPFI 4.3l engines required the higher fuel pressures. The fuel pump I bought was for a '97 S10 which I believe was a CPFI. The higher fuel pressures might just be a requirement for fuel injected engines.

The Chilton I have is quoting 9-13 PSI fuel pressure at idle for a TBI 4.3L.
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