BUILD THREAD 84 Regal back half/caged/mini tubbed lq4/4l80e build

[64nailhead]

The difference between a 3.42 and 3.55 will barely be noticeable. I wouldn’t consider finding a rear that would be happy with a 26 and 29” tire mainly because there isn’t one.

Let’s back up, what cam are you using? Headers or stock manifolds? Stock compression between 9:1-10:1?

I read back through the last page. I’m not sure what tires you’ll be running that are 29”, but 28’s will work fine with a 3.73 at highway speeds, starting line ratio with a good converter (which you have.) If fin intended to put in a 28’s, then I’d pick a gear that will work with them and learn to live with how it runs with the 26’s for a short period. Keep in mind the converter will work differently with a different final drive ratio.

edit. : I found your cam specs on the 1st page. I’d say you want to keep your cruising RPM above 2200-2300 at a minimum.

 

[Roblq84]

I get the trans back tomorrow, a lot of billet parts, transgo shift kit, new clutches, bushings band, etc.

I ran a new return line from cell to engine bay, ditched the c5 ffr, in place installed a summit 10 micron inline filter, and a Holley fuel pressure regulator from Summit, the first regulator I got was pissing from the right side fitting, I couldn’t get it to seal, I ordered another one, and the same exact thing, only the right side port. I tried the Mr gasket fittings, and tried the summit fittings, 3/8 npt with sealant, for the hell of it I switched the ports and plug right to left, flipped the regulator upside down, and it seems to seal fine now after tightening it little more by little, it’s rock solid at 59psi now. Fitech calls for 58. Fuel
Trims all went down since it was dumping alot of fuel and my eyes are no longer burning running it in the garage.

I’m bringing the differential in 2 weeks to install
The trutrac, new bearings, and 4.30s for the 31s

Hopefully after this it should be good to go and finally be able to enjoy it!

 

[Rktpwrd]

Just a heads up, some fuel pressure regulators like my Aeromotive one use ORB (O-Ring Boss) fittings, not NPT. Check and make sure yours aren’t like that.
Nice progress!!

 

[Roblq84]

Just a heads up, some fuel pressure regulators like my Aeromotive one use ORB (O-Ring Boss) fittings, not NPT. Check and make sure yours aren’t like that.
Nice progress!!

Yeah I checked 5 times, they’re definately 3/8 npt, I contacted summit to return these, and bite the bullet for the aeromotive since that’s what they use, orb, I feel like they would seal better, for that price they better!

 

[Roblq84]

picked up the trans, popped it in, adjusted the new shifter, indexed the dipstick 1/4 inch above the machined surface, poured 2 gallons of dex 6 in for
Now, going to wait to top it off when the diff is in and I can go through the gears, ran some heat shield wrapping on a few things, replaced the original cheap fuel cell cap, with a new cheap aluminum one lol atleast this one seals now, after reading for 3 hours of harnesses vs 3 point regular seatbelts and risks with cages/seats/4/5/6 point, I ended up ordering 2 sets of non retractable standard mount 3 point belts, since I’m using regular seats, and the main hoop is pretty far away from my noggin. and all is well, diff is getting done next month, getting a parts list together for it, order the Mickey Thompson sportsman’s 15x18x29s for the 14 inch weld knock offs around summertime and it should be good to go!

I may just wrap the car with gloss black vinyl eventually as well, the car is not worth the body work, but I don’t mind the 💩box look since I know what’s underneath it 😁

found driver side lower quarter panel, going to cut it out, weld, and fill it, I don’t think the company is a sponsor so I’ll refrain from mentioning the brand

Ps I know the regulator should be 6 inches forward of the firewall, but for now that’s the most convenient spot for it 😆

 

[Roblq84]

found out my car has Chrysler .875 axle ends using mo400 sealed bearings, and not ford torinos.

I’m going to have to go with 4.30s the 18.5s aren’t going to clear, so the best option is 31x16.5x15 (or 16 with mts) Section width of 16 (same for both tires) and tread width 12.80 for Hoosiers, (13.90 on mts) on a 14 inch rim which is max recommended should work. I have the height, just not the clearance between frame and quarter panel, plus with the 31s, it should look more tucked which is what I’m wanting. With 4.30s on a 31 inch tire it puts me right in that sweet spot between 2300-2400 rpm cruising 65-70 4.30s would be Equivalent to 29 inch tires with 4.00 gears.

also found my solution to matching wheels in the front, went with the vision sport lites in the front Chinese knock offs of the drag lites, but they have standard machined bores for regular lug nuts, no drilling/tapping/machining studs to get them to fit up. I messed up and purchased 15x8s 4.5bs, but I have about 1/4 inch of clearance from the tie rod, and also tubular upper control arms, and tall upper ball joint, should be just enough to make it, if not I’ll do the smallest spacer of 3mm which I’m trying to avoid.



I’m excited to finally get the look and stance I’ve been imagining with them tucked nicely underneath

 

[Roblq84]

Fronts 205/65/15 on 15x8
I know it should be 225s on 15x8s but it’s tight enough as it is, they will be fine, I already have them and they’re brand new.
No modifications or spacers needed
It’s a tight fit, but there’s just enough clearance from the upper control arm and tie rod, I may grind the tie rod down a hair but no rubbing at all lock to lock

31x16.5x15 Hoosiers on 15x14s
Once the diff is in I’ll adjust the height, it should be sitting nice and tucked in under the quarters is what I’m going for

Exhaust is temporary, just flex pipe to get the fumes away from inside the car, going to do a universal 3 inch kit to get it out the back next month

gears and trutrac come in on Tuesday, and dropping the diff right off, should be all wrapped up by next week finally with the correct combo of everything, it’s been a long 3 years

 

[Roblq84]

Well guys after 3 long years, here it is, got the diff in this morning, cleaned it up, topped off all
The fluids, and took it for a spin, it hauls *ss! Pulls like a train, shifts perfectly, stays straight, and has decent grip at a roll.

I would like to thank all of you for your knowledge and input, especially 64nailhead, it’s all much appreciated, thank you all for helping me make this build possible.

Total weight is 3200lbs, full 20 gallon tank.
With me (170)
3370

Cruising rpm at 65 in od, locked converter was right under 2300, 31s and 4.30s and 4l80, cruises perfectly

Lowered the back about 1.5 inches after photos as well, sits way better

Ps, quarter panel, and gn grill next

-Rob