HEADWATERS CUSTOMSBUILT TO OUTLAST THE ORDINARY
1979 GMC Jimmy High Sierra 4×4

JIMMY

Reprise

Two brothers. Two Jimmys.
One legacy coming full circle.

A frame-off restoration by Headwaters Customs • Big Timber, Montana

EXPLORE THE BUILD ↓

Our vision

True to its roots. Ready for the road ahead.

Jimmy Reprise will be unmistakably a 1979 GMC High Sierra: dark brown metallic, a clean white center band and white removable top. Its stance will be purposeful, with a 2.5–3-inch lift, Bilstein shocks, 33-inch BFGoodrich All-Terrain tires and six-lug Rally-style wheels with beauty rings and GMC center caps.

Underneath, a restored chassis, the familiar 400 small-block and Turbo 400, modern fuel delivery, upgraded brakes and steering, and discreet heating and air conditioning will make this classic as enjoyable to drive as it is to look at. Brown houndstooth upholstery and period-correct trim finish the cabin. The goal is a Jimmy that looks right, drives confidently and is ready for another generation.

Powertrain400 V8 / TH400 retained
Drivetrain4×4
ExteriorDark brown metallic / white
InteriorLight and dark brown houndstooth
EFIHolley Sniper 2 / FiTech Force Fuel
ScheduleApproximately 12 months

Restoration scope

Built to outlast the ordinary

Body & paint

Exterior disassembly, stripping, body preparation, dark brown metallic and white two-tone refinish, jambs and trim.

Frame & chassis

Body/frame separation, frame sandblasting, protective coating, chassis restoration and reassembly.

Engine & fuel

Retain and service the mildly built 400 V8 and TH400; Holley Sniper 2 with PDM and FiTech Force Fuel supplied by the existing mechanical pump.

Steering & brakes

2.5–3-inch lift, Bilstein shocks, steering and suspension service, front disc renewal and rear disc conversion.

Comfort & interior

Old Air CAP-2100 heat/A/C/defrost, brown houndstooth interior, carpet, dash, headliner and trim.

Final assembly

Seals, lighting, wiring cleanup and loom, final adjustments, inspections and road testing.

Progress tracker

From teardown to turn-key

01

Disassembly

02

Frame & chassis

03

Body & paint

04

Drivetrain

05

Brakes & suspension

06

Interior

07

Final QC

Stage statuses will be updated as verified shop progress is posted. No work is marked complete in this initial portal.

Communication schedule

Weekly updates

MONDAYS • This week's plan

Upcoming work, expected parts, scheduling and decisions needed from David.

FRIDAYS • What got done

Work accomplished, new photos where available and any changes to the plan.

These are Headwaters Customs' standard update days. This preview has no live publishing connection yet.

Ask Mike or Chuck

Questions welcome. No guesswork.

What it is

A way to ask about the restoration, discuss ideas and get clarification on the documented build. Mike handles shop decisions. Chuck can help explain the scope and project information.

What it isn't

Not a 24/7 live support service, emergency channel or authorization to change the build. Additional charges and scope changes require written customer approval.

To send a question, contact Headwaters Customs through the confirmed project contact channel. The live messaging feature will be connected during deployment.

Project documents

Scope & approvals

Restoration proposal

Complete frame-off restoration as described above. Wheel/tire selection, seat rebuilding and any newly discovered work require final confirmation.

Payment milestones

50% upon vehicle drop-off • 25% when ready for paint • 25% at completion, before delivery.

Additional work and price changes require customer approval.

Project files

Signed estimate, parts list, before photographs and approved change orders will be linked after final reconciliation and secure hosting setup.

Private billing records will only be shown through authenticated access, not this public preview.