How to diagnose and replace the Transfer Case Seal on a Ford Thunderbird?

Oil leaks are due to worn of extension housing oil seal and bushing or the speedometer drive gear oil seal and O-ring. The general rule of thumb for these seals is that the repair is straightforward; in most cases, the seals can be changed without having to pull the transmission from the car. The extension housing oil seal is located at the rear of the transmission at the driveshaft connection. If leakage is suspected the vehicle must be raised off of the ground on jackstands securely. A leaking seal will cause transmission lubricant to be present on the front on the driveshaft and dripping at the rear of the transmission. In order to remove the oil seal one has to use the screwdriver or pry bar while being as careful as possible to avoid damaging the splines of the transmission output shaft. If removal is challenging, a further set of special oil seal removal tool might be needed. When fitting the new oil seal use a large pipe or deep socket as a drift to ensure that the oil seal is properly aligned and married to the bore. Before fitting the driveshaft back in, a thin grade of grease should be applied on the splines of the transmission output shaft and the outer diameter of the driveshaft sleeve yoke without putting any pressure on the new seal's lip. The speedometer cable with the driven gear housing will be situated on the side of the extension housing; examine for signs of transmission oil around the cable housing for signs of leakage of the seal and O-ring. Remove speedometer cable connector if available, and with a hook pry out the seal. Last, place a new O-ring in the driven gear housing then put back the driven gear housing with the cable assembly to the extension housing.

Genuine Ford Thunderbird Transfer Case Seal

Transfer Case Output Shaft Seal

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6 Transfer Case Seals found

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Ford Thunderbird Oil Seal Assembly
Part Number: E2DZ-7052-A
$15.39 MSRP: $22.50
You Save: $7.11 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Seal Assy - Oil; Extension Housing Seal
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1983-1993 Ford Thunderbird | 4 Cyl 2.3L, 6 Cyl 3.8L, 8 Cyl 5.0L | 3AT C3, 3AT C5, 4AT A4LD, 4AT AOD, 5MT
- 1980-1981 Ford Thunderbird | 6 Cyl 3.3L, 8 Cyl 4.2L, 8 Cyl 5.0L | 3AT C3, 3AT C4, 4AT AOD
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Ford Thunderbird Oil Seal Assembly
Part Number: F7AZ-7052-A
$18.72 MSRP: $26.67
You Save: $7.95 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Seal Assy - Oil
- Replaced by: 7W7Z-7052-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1997 Ford Thunderbird | 6 Cyl 3.8L, 8 Cyl 4.6L | 4AT 4R70W
View related parts
Ford Thunderbird Oil Seal Assembly
Part Number: XW4Z-7052-AA
$11.70 MSRP: $16.67
You Save: $4.97 (30%)
ADD TO CART
Product Specifications
- Other Name: Seal Assy - Oil; Extension Housing Seal
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2002-2005 Ford Thunderbird | 8 Cyl 3.9L DOHC EFI NA | 5-Speed Automatic Transmission 5R55S, 5-Speed Automatic Transmission NAAO 5R55N, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
View related parts
Ford Thunderbird Oil Seal Assembly
Part Number: E9TZ-7052-A
$11.70 MSRP: $16.67
You Save: $4.97 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Seal Assy - Oil
- Replaced by: F6ZZ-7052-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1983-1989 Ford Thunderbird | 4 Cyl 2.3L, 6 Cyl 3.8L, 8 Cyl 5.0L | 3AT C3, 3AT C5, 4AT A4LD, 4AT AOD, 5MT
View related parts
Ford Thunderbird Oil Seal Assembly
Part Number: E8TZ-7052-C
$59.28 MSRP: $86.67
You Save: $27.39 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Seal Assembly - Oil; Extension Housing Seal
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1989-1995 Ford Thunderbird | 6 Cyl 3.8L, 8 Cyl 4.6L, 8 Cyl 5.0L | 4AT 4R70W, 4AT AOD, 5MT
View related parts
Ford Thunderbird Oil Seal Assembly
Part Number: E8TZ-7052-B
Product Specifications
- Other Name: Seal Assy - Oil
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1989-1995 Ford Thunderbird | 6 Cyl 3.8L, 8 Cyl 4.6L, 8 Cyl 5.0L | 4AT 4R70W, 4AT AOD, 5MT

Ford Thunderbird Transfer Case Seal

The Transfer Case Seal of the Ford Thunderbird prevents leakage of lubricant, which helps keep gears cool and lubricated. It prepares them to transmit power to the driveshaft from the transmission. Every Ford 4x4 type is given a seal with a rubber lip that fits snugly around the output shaft, preventing fluid from leaking out and causing overheating, gear wear, and poor shifting. Earlier Thunderbird versions featured a single-lip Transfer Case Seal. Later versions were fitted with a double-lip Transfer Case Seal. The inner edge of the double-lip is spring loaded, while the outer dust wiper is stiffer. This provides better containment during spirited Ford cruising and debris exclusion from the cavity. The primary distinction is the incorporation of additional redundancy, which reduces the probability of leaks should the shaft or bushing start to become loose even the greatly slight bit. If you find a leak underneath your Thunderbird, changing the Transfer Case Seal promptly helps avoid a continuous loss of fluids, which deprives the transfer gears of lubrication and hydraulic pressure. If a bushing is worn or the shaft is grooved, even a new Transfer Case Seal won't work correctly. So examine those parts during service and replace them if necessary to restore the reliable operation of the drivetrain you expect in your classic Ford Thunderbird.

We provide a wide range of Ford Thunderbird Transfer Case Seal at the optimal prices. If you need Ford Thunderbird Transfer Case Seal, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your doorstep with a fast delivery service.

Ford Thunderbird Transfer Case Seal Parts Questions & Experts Answers

Oil Seal Assembly
E2DZ-7052-A
Q: How to diagnose and replace the Transfer Case Seal on a Ford Thunderbird?
A:
Oil leaks are due to worn of extension housing oil seal and bushing or the speedometer drive gear oil seal and O-ring. The general rule of thumb for these seals is that the repair is straightforward; in most cases, the seals can be changed without having to pull the transmission from the car. The extension housing oil seal is located at the rear of the transmission at the driveshaft connection. If leakage is suspected the vehicle must be raised off of the ground on jackstands securely. A leaking seal will cause transmission lubricant to be present on the front on the driveshaft and dripping at the rear of the transmission. In order to remove the oil seal one has to use the screwdriver or pry bar while being as careful as possible to avoid damaging the splines of the transmission output shaft. If removal is challenging, a further set of special oil seal removal tool might be needed. When fitting the new oil seal use a large pipe or deep socket as a drift to ensure that the oil seal is properly aligned and married to the bore. Before fitting the driveshaft back in, a thin grade of grease should be applied on the splines of the transmission output shaft and the outer diameter of the driveshaft sleeve yoke without putting any pressure on the new seal's lip. The speedometer cable with the driven gear housing will be situated on the side of the extension housing; examine for signs of transmission oil around the cable housing for signs of leakage of the seal and O-ring. Remove speedometer cable connector if available, and with a hook pry out the seal. Last, place a new O-ring in the driven gear housing then put back the driven gear housing with the cable assembly to the extension housing.