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Old 10-02-2006, 10:13 PM   #1 (permalink)
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258 to 392 swap

Got the rig running tonight. The major hurdle on this swap was that I wanted to swap the motors but not have to move the tranny. On the 258 it sits about 5 to 6 inches further back. With some massaging of the fire wall by Reuben and the new clutch linkage that I fabed, it worked . Heres a few pics.



Here are the pics of the clutch linkage with the factory V8 clutch parts next to the moded ones.




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Old 10-02-2006, 10:23 PM   #2 (permalink)
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Also, can you guys ask me some questions about this swap so I can post the answers. I'v searched for details on this swap for a couple years and never saw any good wright ups or details. So I'd like to have this as a search result for somebody wanting to do this swap.
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Old 10-02-2006, 10:36 PM   #3 (permalink)
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I'll make you a deal....all day at school tomorow i'll try to think of some questions to ask you as i have none right now.

Looks good, awesome job. need some action shots!

Chris
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Old 10-02-2006, 11:05 PM   #4 (permalink)
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your ac pump is mounted wrong













nice work
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Old 10-03-2006, 09:31 AM   #5 (permalink)
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Here's a dumb questions, but you did replace the tranny right? You just didnt want to change its position. As there is no way the bellhousing on a 258 will match up with the 392.
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Old 10-03-2006, 12:44 PM   #6 (permalink)
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Just looking at the pic of the clutch linkage, there is a distinct change in the dirt/oil coating right at the trans/bell parting line. I'd say offhand that he swapped the bells on the trans prior to dropping the 392 in.

You surprised me Mike.... I didn't figure you for a boat anchor man. I figured when you got tired of the 258, you'd repower with a big 3 or an AMC V8 (since you alread had the AMC bell). Of course that would've required a lot more intensive driveline changes. What t-case are you running? D20?
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Old 10-03-2006, 07:02 PM   #7 (permalink)
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Quote:
Originally Posted by Mechanos
Just looking at the pic of the clutch linkage, there is a distinct change in the dirt/oil coating right at the trans/bell parting line. I'd say offhand that he swapped the bells on the trans prior to dropping the 392 in.

You surprised me Mike.... I didn't figure you for a boat anchor man. I figured when you got tired of the 258, you'd repower with a big 3 or an AMC V8 (since you alread had the AMC bell). Of course that would've required a lot more intensive driveline changes. What t-case are you running? D20?
Yup, swapped in a V8 bell housing. The IH 258 bell housing is a rare bird cause it is for the IH T18/T19 tranny to AMC pattern.
My 392 is bored 60 over has a Cam and has Cheby Big Block valve springs. It's about 350HP and Gobs of torque .
Mech, I'm an IH guy. I'll deal with the extra weight and still spank that Ass
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Old 10-03-2006, 08:21 PM   #8 (permalink)
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...Mech, I'm an IH guy. I'll deal with the extra weight and still spank that Ass
I hear ya there.... so far, my 345 hasn't let me down. There have been times when I'm glad I have all that weight on the front axle.

So, next question.... are you going to leave it carb'd or is EFI in the works?
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Old 10-03-2006, 08:30 PM   #9 (permalink)
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So is the motor shoved farther back than a stock SV motor?? or is the clutch ball on the frame in a different location (i.e. requiring the modification to the linkage).
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Old 10-03-2006, 08:40 PM   #10 (permalink)
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And another question.... are you running any body lift on your rig? I'm less than happy with the horizontal mounting of my York and the vertical pump on your 392 caught my eye. I did some chin scratching and measuring tonight, and I think with the right combination of parts, I can stand mine up without having to run any body lift.
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Old 10-03-2006, 09:10 PM   #11 (permalink)
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So is the motor shoved farther back than a stock SV motor?? or is the clutch ball on the frame in a different location (i.e. requiring the modification to the linkage).
Yes on the motor being shoved back. The ball on the frame is like any other Scout. The 258 is a longer motor than the V8, so the tranny is mounted about 5" back. Thats why I had to modify the clutch Ball on the tranny. Just a little fire wall massaging and the motor fit
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Old 10-03-2006, 09:12 PM   #12 (permalink)
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Quote:
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And another question.... are you running any body lift on your rig? I'm less than happy with the horizontal mounting of my York and the vertical pump on your 392 caught my eye. I did some chin scratching and measuring tonight, and I think with the right combination of parts, I can stand mine up without having to run any body lift.
I'm running a 2" body lift. I'll try to get an actual measurement tomorrow on how much room I have between the hood and compressor.

And I think next year sometime I'll be putting FI on it
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Old 10-03-2006, 10:13 PM   #13 (permalink)
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Quote:
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Thats why I had to modify the clutch Ball on the tranny. Just a little fire wall massaging and the motor fit

I'd be intrested in seeing that.....









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Old 10-03-2006, 10:32 PM   #14 (permalink)
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the shiney spot is where it is pounded in
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Old 11-20-2006, 09:30 PM   #15 (permalink)
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Quote:
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And I think next year sometime I'll be putting FI on it
I couldn't wait till next year. Fuel injection is done .
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Old 11-21-2006, 04:32 AM   #16 (permalink)
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Quote:
Originally Posted by Rock Tractor
I couldn't wait till next year. Fuel injection is done .
So bring the tech why dontcha

I'm itchin to do this
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Old 11-21-2006, 08:11 AM   #17 (permalink)
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Quote:
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I couldn't wait till next year. Fuel injection is done .
I guess we need an updated photo now. Did you go with both fuel and spark control?
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Old 11-21-2006, 08:43 AM   #18 (permalink)
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So bring the tech why dontcha
Or at least an EFI porn pic.
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Old 11-21-2006, 04:36 PM   #19 (permalink)
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the moter shits and gets. he did not use a spark controller. just a 454 throttle body and a harness from AFI. super easy install.0-400 RPM with ZERO hesitation
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Old 11-21-2006, 04:47 PM   #20 (permalink)
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Quote:
Originally Posted by Mechanos
Or at least an EFI porn pic.
well I wasn't trying to get my hopes up too high
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Old 11-21-2006, 04:59 PM   #21 (permalink)
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Quote:
Originally Posted by reuben
the moter shits and gets. he did not use a spark controller. just a 454 throttle body and a harness from AFI. super easy install.0-400 RPM with ZERO hesitation
I think Reuben meant, 600 to 4000 rpm in the blink of an eye


I'll get some photos up soon. I'll explain what we did with the photos.
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Last edited by Rock Tractor; 11-21-2006 at 05:02 PM.
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Old 11-21-2006, 06:33 PM   #22 (permalink)
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yup 600 to 4000, I am not sure why I said 0-400.
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Old 11-21-2006, 06:43 PM   #23 (permalink)
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So Mike, you went fuel only? Any particular reason why you chose not to use fuel and spark control? Just curious...
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