LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

UMI K member + Hooker mount brackets and crossmember

Old Feb 29, 2024 | 09:35 AM
  #1  
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Car: 1989 Trans Am
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Transmission: 700R4
Axle/Gears: 3.42
UMI K member + Hooker mount brackets and crossmember

Hey everyone. Car is going to get swapped soon and I wanted to use the UMI 2401 K member.

6.0 with a 4L60E and using Blackheart mount brackets and crossmember.

Should be good to go?

Thanks!
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Old Feb 29, 2024 | 10:57 AM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: UMI K member + Hooker mount brackets and crossmember

You are going to need a means to bolt the Holley brackets to the pad on that K-Member. Meaning, the UMI pad is designed to use either their SBC or LSX engine mounts whereas the Holley mounts are designed for the stock k-member bolt pattern. They do not place nice together. I'd run the UMI mounts, since it is designed with their K-member in mind. You can still use the blackheart crossmember even if engine mount positions aren't exactly identical between the two brands. The Holley mounts position the engine a half inch farther forward. While this is fine for the stock k-member, you'll have sump clearance issues with an LS f-body oil pan and the UMI tubular unit (assuming you are running this style pan).
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Old Feb 29, 2024 | 12:24 PM
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Car: 1989 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42
Re: UMI K member + Hooker mount brackets and crossmember

Hey @ShiftyCapone ,

Forgot to mention I'll be using the 302-2 pan.

I always thought the UMI k member was compatible with stock SBC brackets. Figured the holley ones would just bolt right on. I don't mind if I need to drill a hole or 2 lol.

I don't mind running the stock piece either but the UMI unit looks so good and the extra clearance always helps.
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Old Feb 29, 2024 | 01:03 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: UMI K member + Hooker mount brackets and crossmember

The base K-member is sorta universal as they actually call it their small block platform. Their pads accept their LSX mounts #2409 or you can reuse your SBC mounts if you are not going LS. I tried to use OEM LS1 clamshell mounts and it was just too tight of a fit and I didn't like the way the engine sat. I went through a few combos before I just bought all the UMI stuff. The 302 pan will greatly help you when it comes down to clearance. I am running an F-body pan with their road race k-member and there is barely any clearance to the sump of my pan. The sump is around 2" shorter on the 302 pan.
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Old Feb 29, 2024 | 01:48 PM
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Car: 1989 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42
Re: UMI K member + Hooker mount brackets and crossmember

@ShiftyCapone Then I think I'll probably just stay with the stock K member. The rest of the car is pretty much the UMI catalogue for thirdgens haha.
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Old Feb 29, 2024 | 01:50 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: UMI K member + Hooker mount brackets and crossmember

Originally Posted by George Klass
@ShiftyCapone Then I think I'll probably just stay with the stock K member. The rest of the car is pretty much the UMI catalogue for thirdgens haha.
I think this is the way to go. If I had to do it all over again I probably would have stay with the stock k-member a well. Would have been less headache.

Last edited by ShiftyCapone; Feb 29, 2024 at 01:53 PM.
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Old Mar 1, 2024 | 11:14 AM
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Engine: LT1
Transmission: T56 Street Twin
Axle/Gears: 12 Bolt 3.90
Re: UMI K member + Hooker mount brackets and crossmember

I run that exact set up, but with an fbody pan. All works fine. UMI K with their mounts, Holley motor mounts. Holley trans mount.
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Old Mar 1, 2024 | 11:56 AM
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Car: 1989 Trans Am
Engine: L03
Transmission: 700R4
Axle/Gears: 3.42
Re: UMI K member + Hooker mount brackets and crossmember

Originally Posted by Neil350
I run that exact set up, but with an fbody pan. All works fine. UMI K with their mounts, Holley motor mounts. Holley trans mount.
Hey! UMI mount brackets with holley clamshell and poly mounts?
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Old Mar 1, 2024 | 01:40 PM
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Axle/Gears: 12 Bolt 3.90
Re: UMI K member + Hooker mount brackets and crossmember

Thats right George, UMI LS motor mounts that come with their K, Holley 98-02 mounts with the Polly inserts, ARP bolts to the motor.
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